For this update (2013), the Trials Search Co-ordinator of the Cochrane Schizophrenia Group (CSG) searched the CSG Trials Register
(July 2012), which is based on regular searches of major medical and scientific databases. The principal authors conducted two further
searches (8 October 2012 and 15 January 2013) of the Cochrane Database of Systematic Reviews, MEDLINE and PsycINFO. A
separate search for trials of contingency management was completed as this was an additional intervention category for this update