For the original version of this review, comments on all aspects of the review by Kristian Wahlbeck have been greatly appreciated. The authors wish to thank Eila Sailas for her help in the selection of trials and in double‐checking data extraction. Thanks go to Anne Vainikka, Kristiina Holmberg and Asko J Huotarinen at the Central Library of Health Sciences Terkko, Helsinki, Finland, who uncomplainingly dealt with our requests for articles. Thanks to Stina Blomberg and Siv Laxén, who have been helpful in translating articles in Spanish and Ulla Wang in translating a Chinese study. The review authors sent several letters to authors of studies, asking for extra information about their trials. Dr Atkinson, Dr Herz, Dr Hornung, Dr Lesage, Dr Macpherson, Dr Pitschel‐Walz, Professor Tarrier and Dr Youssef were kind enough to respond, for which we are very grateful.

For the 2010 update, the authors would like to thank Samantha Roberts for running the trial search, Clive Adams for editorial input and John Rathbone for practical guidance during the stage of writing up.

The Methods section of this review uses text from the Cochrane Schizophrenia Group's generic text for methods sections. This has been written over a period of years to ensure consistency and clarity. We fully acknowledge use of this text which we have adapted for relevance to this particular review.