Date	Event	Description
5 December 2011	Amended	Search updated. Twenty‐three reports added to Studies awaiting classification (Kinnunen 2007a; Bastian 2010; Brouwer 2006a; Craigie 2011a; Cramp 2006a; Davenport 2011a; Ebbeling 2007a; Ferrara 2008; Ferrara 2011a; Fjeldsoe 2010a; Huang 2011a; Kearney 2005; Kearney 2006a; Keller 2011a; Krummel 2010a; Liu 2009a; Lovelady 2009a; Mohammad 2011a; Moreau 2007a; Norman 2010a; Ostbye 2008a; Ostbye 2009a; Stendell‐Hollis 2011a).
1 August 2008	Amended	Contact details updated
4 February 2008	Amended	Converted to new review format.
4 February 2008	Feedback has been incorporated	We have replied to the previously published feedback, as a result of which we have also edited the Abstract's Conclusions.
23 April 2007	New citation required and conclusions have changed	Substantive amendment