Registered studies, protocols and reported results
Studies
Clinical study protocols and source-reported registry results, preserved locally.
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Registered studies, protocols and reported results
Clinical study protocols and source-reported registry results, preserved locally.
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Registered studies, protocols and reported results
Study registrations describe protocols. Results are shown only when the registry supplied a Results section; local links are not efficacy claims.
255 exact matches
Snapshot 14/09/2026Parkinson's disease psychosis
Open study recordThe goal of this clinical trial is to compare benzhexol and procyclidine for improving tremor in adults with tremor-predominant Parkinson's disease who are taking levodopa. Researchers will compare the two medicines to determine whether benzhexol provides similar improvement in tremor to procyclidine and to assess their side effects. Participants will be randomly assigned to receive either benzhexol or procyclidine in addition to their usual levodopa treatment. Motor symptoms and side effects will be assessed before treatment and at 2 weeks, 3 months, and 6 months. This randomized clinical trial will compare the effectiveness of benzhexol and procyclidine in improving tremor in patients with tremor-predominant Parkinson's disease who are receiving levodopa therapy. Eligible participants will be adults aged 40 to 70 years with clinically diagnosed Parkinson's disease, predominant tremor at presentation, Hoehn and Yahr stage 1, 2, or 3, and resting tremor while receiving levodopa/carbidopa monotherapy. Participants with cognitive or behavioral abnormalities, lower urinary tract symptoms, benign prostatic hyperplasia, angle-closure glaucoma, or cardiac disease will be excluded. Participants will be randomly assigned to one of two treatment groups. Group A will receive benzhexol and Group B will receive procyclidine, in addition to their existing levodopa treatment. Benzhexol will be started at 2 mg on the first day, increased to 2 mg twice daily on day 4 and to 2 mg three times daily on day 7, with subsequent dose adjustment according to tremor response and tolerability. Procyclidine will be started at 2.5 mg three times daily on day 1, increased according to the protocol to a maximum of 5 mg three times daily by day 7, with subsequent dose adjustment according to tremor response and tolerability. Motor symptoms will be assessed using Part III of the Movement Disorder Society Unified Parkinson's Disease Rating Scale (MDS-UPDRS-III). The primary assessment will focus on the total tremor subset score comprising the following eight items: postural tremor of the right hand, postural tremor of the left hand, rest tremor amplitude of the right upper extremity, rest tremor amplitude of the left upper extremity, rest tremor amplitude of the right lower extremity, rest tremor amplitude of the left lower extremity, rest tremor amplitude of the lip/jaw, and constancy of rest tremor. Improvement will be assessed as the absolute change in the total tremor subset score from baseline, with the primary comparison made at the 2-week follow-up. The study aims to determine whether benzhexol provides at least similar improvement in tremor compared with procyclidine. Participants will be assessed at baseline and at 2 weeks, 3 months, and 6 months after treatment initiation. MDS-UPDRS-III assessments will be performed by an independent observer, and adverse effects and tolerability of the study medications will be assessed and documented at follow-up visits. The planned study enrollment is 88 participants, with 44 participants allocated to each treatment group. The study will be conducted in the Department of Neurology, Mayo Hospital, Lahore.
This study will evaluate whether metformin when it will be given to patients with Parkinson's disease along with standard therapy (levodopa carbidopa) will improve motor symptoms and decreases levels of alpha synuclein and MDA in patients with PD as compare to PD patients receiving only standard therapy (levodopa carbidopa)
Open study recordIt is an open-label, balanced, randomized, five-treatment, five-period, five-sequence, multiple oral dose, crossover comparative bioavailability study of different strengths of carbidopa/levodopa extended-release tablets with carbidopa and levodopa tablets in normal, healthy adult human subjects under fasting and fed conditions. The primary objective of the study is to compare the pharmacokinetic profiles between WD-1603 extended-release formulations and carbidopa and levodopa tablets 25mg/100mg following three times a day after oral administration in fasting and fed conditions in healthy subjects and to compare relative bioavailability between treatments. Study WD-1603-1005 is to compare the fluctuation index between WD-1603 extended-release formulations and Carbidopa and Levodopa Tablets following three times a day oral administration and the food effect on the initial absorption of levodopa in the morning in healthy subjects. At least 15 subjects will be enrolled at the beginning of the study and the order of receiving the Treatment A, B, C, D \& E for each subject during all the periods of the the study will be determined according to a randomization schedule.
Open study recordA prospective cohort of patients scheduled to undergo deep brain stimulation (DBS) implantation surgery for the treatment of Parkinson's disease as per standard of care will be invited to participate in this study. This mechanistic study is aimed at better understanding the role of basal ganglia beta band (11-35 Hz) oscillations and resonance in the manifestation of Parkinson's disease (PD) motor signs using closed-loop electrical neurostimulation, levodopa medication, and computational modeling. The ultimate goal of this study is to inform the development of closed-loop neuromodulation technology that can be programmed and adjusted in real time based on patient-specific neural activity. While much research has been dedicated to understanding the pathophysiology of Parkinson's disease (PD), the neural dynamics underlying the manifestation of motor signs remain unclear. Studies over the past two decades have shown a correlation of the amplitude and incidence of beta band oscillations in the subthalamic nucleus (STN) with changes in bradykinesia and rigidity mediated by levodopa or deep brain stimulation (DBS) therapies. Yet, no study has conclusively or deductively demonstrated a causal link. A limitation to establishing causality is the lack of available neuromodulation tools capable of predictably and precisely controlling neural oscillatory activity in the human brain in real time without introducing confounding factors. Establishing these tools and clarifying whether the relationship of beta band oscillations with PD motor signs is causal or epiphenomenon are critical steps to better understand PD pathophysiology and advance personalized DBS technology in PD and other brain conditions. This study aims to address these technology and knowledge gaps by leveraging feedback control engineering and patient-specific computational modeling tools. In this study, the investigators will employ a neural control approach, referred to as evoked interference closed-loop DBS (eiDBS), to characterize the degree by which controlled suppression or amplification of beta oscillations in the STN influences bradykinesia and rigidity in PD (Specific Aim 1, SA1). The investigators will test the hypothesis that stimulation-induced suppression or amplification of beta oscillations in the STN will result in changes in bradykinesia and rigidity measures. In SA2, the investigators will employ levodopa medication to characterize how changes in bradykinesia and rigidity relate to variations in the amplitude of neural oscillations in the STN and primary motor cortex (MC) evoked by STN stimulation. The investigators will test the hypothesis that levodopa administration will result in a decrease in the amplitude of stimulation-evoked beta oscillations that will correlate with changes in bradykinesia and rigidity. The results from SA2 will help to gain a greater understanding of intrinsic circuit dynamics associated with PD and identify strategies to optimize closed-loop DBS algorithms (e.g., eiDBS) in the face of concurrent levodopa therapy, a step to bring this technology to future clinical trials. Combining electrophysiological data with high-resolution (7T) magnetic resonance (MR) imaging and computational modeling, the investigators will examine which specific neuronal pathways connected with the STN need to be activated to evoke frequency-specific neural responses in the STN and MC (SA3). The data from SA3 will shed light on which sub-circuits are involved in the generation of stimulation-evoked and spontaneous beta oscillations in PD, and inform how to use directional DBS leads to shape electric fields in the STN to selectively modulate the STN via eiDBS or other neurostimulation techniques. The investigators will address the three aims of this study with the participation of PD patients implanted with DBS leads in the STN, whose DBS lead extensions will be externalized and connected to our recording and closed-loop stimulation infrastructure.
Open study recordThis study is being conducted at the Morsani College of Medicine to determine whether signals recorded from the eyes and brain can be used as a noninvasive way to monitor dopamine function. Approximately 50 adults (25 with Parkinson's disease and 25 without Parkinson's disease) will participate. Participants will undergo electroretinography (ERG) and electroencephalography (EEG), which are FDA-approved, noninvasive devices that measure electrical activity from the retina and brain using sensors placed on the skin around the eyes and scalp. Participants with Parkinson's disease will be tested before and after taking their prescribed Parkinson's medication (e.g., Sinemet® \[carbidopa/levodopa\]). Participants without Parkinson's disease will receive a single dose of compounded levodopa/carbidopa eye drops (an FDA-approved drug used in an unapproved ophthalmic formulation) in one eye and a placebo eye drop in the other eye. The placebo consists of the same vehicle solution without levodopa/carbidopa and contains 0.1% ascorbic acid, 0.001% benzalkonium chloride, and phosphate-buffered saline. Randomization will be used to determine which eye receives the levodopa/carbidopa eye drop and which eye receives the placebo. Researchers will compare measurements obtained before and after treatment to evaluate whether blue-light visual responses are associated with dopamine activity. Recent reports show that visual electroencephalographic (EEG) processing of event related potentials (ERPs) is dysregulated in subjects with opioid use disorder (OUD) and that blue color cognitive processing is potentially robust enough to serve as a electrocortical biomarker for brain dopamine (DA) with a significance level of p\<0.0001 (Cohen's d 0.89). Blue color processing in the retina is mediated by DA-containing amacrine cells and co-varies with brain DA. With the adoption of a more robust physiological approach, mainly electroretinographic (ERG) recordings combined with ERPs, this might be increased to higher significance levels, towards the goal of achieving an accurate biomarker of brain DA. This approach is being pursued using the S-cone ERG response blue cone ERG response, which is modulated by DA levels in the retina. This would be a physiological approach that can be accomplished in the clinic by primary and secondary health professionals quickly and non-invasively with FDA-approved ERG instruments typically used by ophthalmologists to determine the function of the retina. In this study, ERGs and ERPs will be recorded in 25 Parkinson's (PD) subjects and 25 non-PD age-matched controls with a suite of light stimulation procedures to evaluate physiological and cognitive measures of blue color processing. This will be accomplished before and after administration of drug treatment for PD (e.g., Sinemet) in PD subjects. Specific Aim: Assess feasibility and characterize a noninvasive electrocortical biomarker of brain DA by integrating blue cone S-cone ERG response ERG with ERPs, and test its specificity / sensitivity to DAergic modulation in PD and non PD controls. This aim will be accomplished by recording ERG and ERP responses to blue light stimulation in 25 PD subjects and 25 age matched controls, before and after pharmacologic with Levodopa/Carbidopa eyedrop intervention. The core hypothesis of this proposal is that blue color processing, including cortical processing, has the potential to be a psychophysical biomarker of brain DA and monitoring of treatment efficacy for treatment of PD, drug abuse, and other DA-dependent disorders. Dopamine (DA) has many functions in the brain and is implicated in a host of psychiatric disorders including PD, schizophrenia, obsessive compulsive disorder, depression, sleep disturbances, restless legs syndrome, attention-deficit hyperactivity disorder, and drug addiction. These neuropsychiatric disorders are associated with both increased and decreased DA transmission in the brain. One goal for the treatment of lowered DA levels characteristic of addiction and PD is to enhance its release in the mesolimbic and nigrostriatal DA systems, which originate in the midbrain and project to the striatum. Currently, this is accomplished with drug therapies that enhance DA synthesis, metabolism, or receptor responses towards the goal of enhancing DA synthesis, transmission, and processing. An important component for any therapeutic individual multimodal addiction treatment plan would be to identify specific biological changes that could be used to diagnose, monitor and tailor treatment objectively. For over three decades, DA, its receptors, transporters, precursors, and metabolites in the mesolimbic and nigrostriatal DA pathways have been investigated as potential biomarkers for PD and drug abuse. The most established, albeit recently controversial, biomarker for brain DA is the quantity of a DA subtype-2 receptors (D2Rs) in the striatum, as measured by positron emission tomography (PET). The number of brain D2Rs are directly proportional to the levels of DA in the brain and its associated activity and transmission\[4\]. However, PET scans are cost-prohibitive for clinical practice. In addition to cost, invasiveness and radiation risk preclude PET scans as a routine clinical tool for assessment of D2R and DA levels in the brain. Interestingly, D2Rs are not only detectable in the brain but are also expressed in peripheral tissues where they play a role in a variety of physiological functions. It has been suggested that D2Rs in the blood may be a peripheral biomarker of brain DA. Accordingly, we have reported that blood DA levels, but not other catecholamines like norepinephrine or epinephrine, are enhanced in RLS with downregulation of lymphocyte and monocyte D2Rs. In PD subjects and in an animal model of PD, we have recently reported that D2Rs expressed on specific populations of blood leukocytes are a potential peripheral biomarker of brain DA in PD. Although this study revealed high significance levels for expression of D2Rs on select leukocytes in PD and in the animal model of PD, an effective biomarker needs to approach sigma levels of significance levels to be considered reliable as an objective index of disease state. Thus, although D2R expression in the periphery remains a viable approach to monitoring brain DA, there is no reliable, non-invasive, or even well-accepted molecular, neurochemical, physiological, or perceptual biomarker of brain DA for diagnosis of DA-dependent brain disorders or for monitoring treatment efficacy currently in clinical use. The lack of an effective biomarker of brain DA has stalled innovations in treatment strategies for DA-dependent disorders and conditions. Ideally, a highly significant biological index based on molecular and/or physiological effects in the periphery that reflect brain DA accurately and could be accomplished with existing clinical tools and non-invasively would be a significant contribution to the field. Other than that described above in a published study on cognitive measures of blue color processing in opioid addicts, ERGs or ERPs in PD subjects has not been recorded.
Open study recordThis study will explore the safety, pharmacokinetics (PK) and pharmacodynamics (PD) of KP405 as a potential new treatment for Parkinson's disease.
Open study recordThis study is a Phase III multicentric randomized controlled trial with parallel group design and waiting list in patients that have an indication to undergo intestinal L-Dopa + entacapone (Lecigon®) under the existing indication criteria (according to SmPC (Fachinformation) Lecigon®). As primary endpoint, we will analyze the difference of the pre-interventional baseline and 6-month follow-up on the "hyperdopaminergic symptoms" corresponding to section 3 of the "Ardouin Behavioural Scale" hypothesizing on the superiority of LECIG therapy compared to best medical treatment.
Open study recordThis is a randomized, placebo-controlled, double-blind, 2-period study evaluating the safety and pharmacokinetics (PK) of ND0612 in Parkinson's disease (PD) patients on an optimized oral levodopa (LD) regimen and experiencing ≥2 h/day of OFF time. Safety and tolerability, PK profile, pump usability, and the potential clinical effect of ND0612 will be explored in subjects with PD and motor fluctuations. During Period 1, patients continued on their current standard of care (SoC) levodopa/carbidopa (LD/CD) and were randomized at 2:1 ratio to 14 days of adjunct treatment with ND0612 (daily LD/CD dose of 270/63 mg) or placebo infusion. During Period 2, patients were randomized to receive 7 days open-label treatment with ND0612 or ND0612 plus oral entacapone. Patients then entered a 4-week safety follow-up period.
Open study recordThe purpose of this study is to investigate whether speed-dependent measures of gait (so called gait signatures) can be identified in patients with neurological conditions that affect gait, particularly in subjects with parkinsonian disorders. This study aims to determine whether the gait patterns, modeled as gait signatures, in these subjects differ in predictable and quantifiable ways from those of age- and sex-matched healthy controls (cross sectional data). This will be conducted by asking 40 Parkinsonian disorder subjects and 40 age-matched healthy control subjects to walk 9 trials over an 18 ft walkway embedded with pressure sensors at baseline, self-selected slower and faster speeds. In addition, the protocol aims to investigate whether clusters of gait patterns can be identified within subgroups of individuals with parkinsonian disorders with varying co-morbidities or treatment conditions as well as patients with ataxia or huntington's disease. For this aim an additional 20 Parkinsonian disorder subjects need to be recruited. Patients with parkinsonism as defined by UK PD Brain Bank Criteria (n=60), subjects with acquired or inherited ataxic syndromes (n=10), age- and sex matched controls (n=40) and young healthy controls (n=30) will be recruited. The cohort of young healthy controls serves to validate gait analysis modeling.There is an optional second visit in the protocol during which approximately 20 subjects with Parkinsonian disorders, who are willing to come off antiparkinson medication and if applicable, off both medication and deep brain stimulation, are asked to walk an additional 9 trials. The PD and older healthy control subjects have to option to be followed longitudinally.
Open study recordIt is a phase II randomized, parallel, double-blind, placebo-controlled, multi-center clinical trial of the efficacy and safety of WD-1603 Carbidopa-Levodopa Extended-Release Tablets in patients with Parkinson's disease. The objective of the study is to access the safety and efficacy of WD-1603 carbidopa-levodopa extended-release tablets in patients with Parkinson's disease. Eligible subjects of the study will be randomly assigned into four groups at a ratio of 1:1:1:1: three treatment groups and one placebo group. The subjects will take trial drugs orally three times a day, in the morning before meals, and the second and third medications will be taken after meals, once every 5 hours.
Open study recordAchieving sustained blood levels of carbidopa/levodopa has been a challenge in the treatment of PD and although levodopa remains the most commonly used drug, motor fluctuations remain a major disability especially in advanced Parkinson's disease. The aim of this study is to determine the efficacy of a novel oral carbidopa-levodopa formulation in achieving a sustained blood level of levodopa and carbidopa in normal volunteers.
Open study recordParkinson's disease (PD) is a progressive neurodegenerative disorder primarily characterized by motor symptoms such as bradykinesia, rigidity, and tremor. However, non-motor symptoms, particularly anxiety and depression, are also common and substantially affect patients' daily functioning and quality of life. Cannabidiol (CBD), a non-intoxicating constituent of Cannabis sativa, has demonstrated anti-inflammatory, antioxidant, and anxiolytic properties and has shown therapeutic potential in several clinical settings. The aim of this study was to evaluate the efficacy and safety of full-spectrum CBD oil administered at three different doses (30 mg/day, 60 mg/day, and 300 mg/day) as adjunctive therapy for anxiety and depressive symptoms in patients with Parkinson's disease. This randomized, double-blind, dose-ranging clinical trial enrolled 27 participants with Parkinson's disease and moderate anxiety-depressive symptoms. Participants aged 40 to 70 years, diagnosed with Parkinson's disease at least four years before enrollment and presenting with moderate or greater anxiety-depressive symptoms, were randomly assigned in a 1:1:1 ratio to receive full-spectrum CBD oil at doses of 30 mg/day, 60 mg/day, or 300 mg/day for two months. Assessments were conducted at baseline, Month 1, Month 2 (end of treatment), and Month 3 (1-month post-treatment follow-up) to evaluate treatment effects and safety after treatment discontinuation. Primary outcomes included changes in anxiety and depression severity measured using the Beck Anxiety Inventory (BAI) and Beck Depression Inventory-I (BDI-I). Secondary and other pre-specified outcomes included assessments of sleep quality, fatigue, cognitive functioning, psychosis symptoms, quality of life, motor and non-motor symptoms of Parkinson's disease, daytime sleepiness, pain, wearable sensor-derived motor assessments, and participant-rated treatment effectiveness. The CBD oils used in the study were prepared under controlled conditions and tested to verify CBD concentration and the absence of contaminants, including heavy metals and mold contamination. Participants were monitored throughout the study for adverse events, including somnolence, fatigue, gastrointestinal symptoms, and potential treatment-related safety concerns. The study evaluated the potential role of CBD as an adjunctive treatment for anxiety and depressive symptoms in Parkinson's disease and assessed the safety and tolerability of different CBD dosing regimens. The duration of participation for each participant was approximately three months, including a two-month treatment period and a one-month follow-up assessment.
Open study recordThe primary objective of the study is to assess the effectiveness of LECIGON® treatment on the reduction in OFF time (h/day) from baseline at 12 months as measured by Movement Disorder Society-Unified Parkinson's Disease Rating Scale, Part IV (MDS-UPDRS IV).
Open study recordThe study is a multicenter, randomized, double-blind, double-dummy, active-controlled, Phase III clinical study. The aim of this trial is to evaluated the efficacy and assessed the safety of HRG2010 compared with a sustained-release cabridopa-levodopa formulation in Parkinson's Disease With Motor Fluctuations.
Open study recordParkinson's disease (PD) is a neurological condition, which affects the brain. PD gets worse over time, but how quickly it progresses varies a lot from person to person. Some symptoms of PD are tremors, stiffness, and slowness of movement. This study will assess how safe and effective ABBV-951 is in adult participants with PD. Adverse events and change in disease activity is evaluated. ABBV-951 is an investigational (unapproved) drug containing Levodopa Phosphate/Carbidopa Phosphate (LDP/CDP) given as an infusion under the skin for the treatment of Parkinson's Disease. Adult participants with advanced PD and who have completed M15-736 or M20-339 study will be enrolled. Approximately 130 participants will be enrolled in the study in approximately 60 sites in the United States and Australia. Participants will receive continuous subcutaneous infusion (CSCI) (under the skin) of ABBV-951 for 96 weeks during the Primary Treatment Period and during the optional Extended Treatment Period. There may be higher treatment burden for participants in this trial compared to their standard of care. Participants will attend regular visits during the course of the study at a hospital or clinic. The effect of the treatment will be checked by medical and remote telephone assessments, blood tests, checking for side effects, and completing questionnaires.
Open study recordParkinson's disease (PD) is a neurological condition, which affects the brain. PD gets worse over time, but how quickly it progresses varies a lot from person to person. Some symptoms of PD are tremors, stiffness, and slowness of movement. The purpose of this study is to continue testing whether ABBV-951 is safe, effective, and tolerable in participants with Parkinson's disease after completion of the parent study M15-741. ABBV-951 is an investigational (unapproved) drug containing levodopa phosphate/carbidopa phosphate (LDP/CDP) given as infusion under the skin for the treatment of Parkinson's Disease. Participants who have successfully completed M15-741 study will immediately enter this study's treatment period to continue receiving ABBV-951. Adult participants with advanced PD will be enrolled. Approximately 130 adult participants will be enrolled in the study at approximately 65 sites worldwide. Participants will receive continuous subcutaneous infusion (CSCI) of ABBV-951 for 24 hours daily during the Primary Treatment Period and during the optional Extended Treatment Period. There may be higher treatment burden for participants in this trial compared to their standard of care. Participants will attend regular clinic visits and have remote assessments completed via phone calls during the course of the study. The effect of the treatment will be checked by medical assessments, blood tests, checking for side effects, and completing questionnaires.
Open study recordThis observational study is designed to collect data on the use of the drug Lecigon® in daily clinical practice. The study is organised and funded by a pharmaceutical company called Britannia Pharmaceuticals Ltd (Britannia). Lecigon® is prescribed by physicians in advanced Parkinson's disease when patients suffer from uncontrollable fluctuations in mobility, so-called motor fluctuations, which cannot be adjusted well with oral treatment, i.e. medication for swallowing. In this study, data on the effect and possible side effects from everyday treatment with Lecigon® will be collected and scientifically evaluated. The study is intended to supplement the results of previous clinical studies with clinical data in routine medical care, collected from approximately 300 patients. Study design: Non-interventional study, primary data collection. No visits or measurements will be made mandatory by the observational plan. The assignment of patients to Lecigon® not decided in advance by the study's observational plan but falls within current practice. Prescription of Lecigon® occurred before and independently of the decision to include the patient in the study. The participating centres will offer participation in the ELEGANCE study to all patients who receive treatment with Lecigon® part of routine clinical practice. From patients, who switched to treatment with Lecigon® prior to signing of informed consent, baseline data will be collected retrospectively. The planned non-interventional study aims to collect real-world data on the effectiveness and safety of Lecigon® as a therapy for advanced Parkinson´s Disease in routine care in Germany and Austria. The study will be expanded to additional European countries as soon as marketing authorisation in these countries and commercial stock will be available. Primary Objectives: * Long-term effectiveness of Lecigon® * Long-term safety of Lecigon® Secondary Objectives: * Patient non-motor symptoms and quality of life * Healthcare resource utilisation by patients
Open study recordThis is a randomized, double-blind, single center, phase 2 study to assess efficacy and safety of multiple HB-adMSCs vs Placebo for the treatment of Parkinson's disease. The trial includes a screening period of up to 4 weeks, a 32-week treatment period, and a safety Follow-up period of 20 weeks after the last investigational product administration. This clinical trial will be open to enroll 24 eligible participants diagnosed with Parkinson's disease. Patients' recruitment will be conducted by the study team, if eligible participants are identified based on eligibility criteria, a screening visit will be scheduled. Informed consent form will be given to the study participants and signed before any study procedures. Informed consent form will include information about the clinical trial and some aspects should be considered during this process.
Open study recordNeuroinflammation is considered one of the most important factors contributing critically to pathophysiology of PD . Recently, high mobility group box-1 (HMGB1) protein has been encoded as a potential inflammatory biomarker in PD. HMGB1 mediates immune response mostly through endothelial cells and macrophage activation via targeting two vital cell receptors; Toll-like receptor 4 (TLR4) and advanced glycation end products (RAGE).
Open study record