Sonia Johnson

February 8, 2023

Acceptability and feasibility of using contingency management for cannabis reduction in specialist mental health services for psychosis: A qualitative study of staff views

Abstract Aim: There is increasing evidence linking cannabis use to onset, continuation, and relapse of psychosis. Contingency Management (CM) is…

August 15, 2019

Clinical and cost-effectiveness of contingency management for cannabis use in early psychosis: the CIRCLE randomised clinical trial

Abstract Background: Cannabis is the most commonly used illicit substance amongst people with psychosis. Continued cannabis use following the onset…

October 22, 2016

A randomised controlled trial of the clinical and cost-effectiveness of a contingency management intervention compared to treatment as usual for reduction of cannabis use and of relapse in early psychosis (CIRCLE): a study protocol for a randomised controlled trial

Abstract Background: Around 35–45 % of people in contact with services for a first episode of psychosis are using cannabis.…

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