Search methods for identification of studies
Electronic searches
We conducted a systematic search, using 29 September 2010 as
the cut-off date, in the following electronic databases:
• The Cochrane Library, issue 9 2010 (via Wiley);
• PubMed;
• EMBASE (Embase.com);
• CINAHL (Ebsco);
• PsycINFO (PsycNet).