Date	Event	Description
17 August 2011	New citation required but conclusions have not changed	Deirdre Murphy and Susan MacDonald stepped down as authors. Andrew Weeks joined the team
17 August 2011	New search has been performed	Search updated in February 2011: two new studies included (Jangsten 2011; Jerbi 2007); four excluded (Abdel-Aleem 2010; Hoffman 2006; Ramirez 2001; Vasegh 2005); and one added to Studies awaiting classification.
		Protocol section updated - see Differences between protocol and review.