Date	Event	Description
20 March 2014	Amended	Correction of effect estimate (from RR to OR) for one outcome in comparison 1, and consequential amendments to review text.
6 August 2012	Feedback has been incorporated	Abu Hashim 2011a excluded in response to feedback
15 May 2012	New citation required but conclusions have not changed	There is insufficient evidence for the conclusions to this review to be changed.
15 May 2012	New search has been performed	This review was first published in 1998. Updates were published in 2001 and 2007. Nine trials were included in the 2007 version. In the current update an additional 16 studies have been added to the meta‐analysis: Abdellah 2011; Abu Hashim 2010; Abu Hashim 2011; Abu Hashim 2011b; Ashrafinia 2009; Amer 2009; Ghafarnegad 2010; Hamed 2010; Palomba 2004; Palomba 2010; Rimington 1997; Roy 2009; Roy 2010; Sharma 2006; Youssef 2007; Zakherah 2009; Zakherah 2010.
11 November 2008	Amended	Converted to new review format.
1 May 2007	New citation required and conclusions have changed	Substantive amendment