Date	Event	Description
15 September 2016	New search has been performed	Updated version
15 September 2016	New citation required but conclusions have not changed	Thirteen new studies (Baracat 2002;Benedek‐Jaszmann 1987;Bouchard 2012;Gupta 2013;Jacobsen 2012;Mendoza 2000;Morais‐Socorro 2012;Okon 2005;Polisseni 2013;Ross 1999;Uygur 2005;Volpe 1986;Wender 2004) added and additional data included for one study (Langer 2006). Two reports of the same study (Ziaei 2010) amalgamated. Total of 46 studies in updated review
20 September 2010	New search has been performed	Contact details updated.
9 February 2010	Amended	made corrections according to Editorial Board's requests
23 March 2006	New citation required and major changes	Substantive amendment