Date	Event	Description
30 June 2015	New citation required but conclusions have not changed	Update completed, no new included studies added.
11 June 2014	New search has been performed	Results of 2012 and 2013 search added to the review. No new studies are included. Four studies added to excluded studies table.
23 October 2013	Amended	Update search of Cochrane Schizophrenia Group's Trials Register (see Search methods for identification of studies); 12 studies added to awaiting classification references.
25 July 2012	Amended	Update search of Cochrane Schizophrenia Group's Trials Register (see Search methods for identification of studies); three studies added to awaiting classification.