Date	Event	Description
17 February 2016	New search has been performed	Search updated. The methods updated and the analyses have been restructured. 'Summary of findings' table has been incorporated.
17 February 2016	New citation required but conclusions have not changed	Nine new studies added for this update (Attawattanakul 2015; Balci 2010; Goodner 1979; Gyamfi‐Bannerman 2016; Khazardoust 2012; Lopez 1989; Mansouri 2010; Porto 2011; Shanks 2010). The review now includes a total of 30 studies. The conclusions remain unchanged.