Date	Event	Description
30 March 2016	New citation required but conclusions have not changed	Two additional studies included (Shobeiri 2014; Yarandi 2015), four additional studies excluded
18 January 2016	New search has been performed	New search conducted 18 January 2016
28 March 2012	New citation required and conclusions have changed	Five records were identified from the updated search: one new study was included (Mousavi 2012); three records were added to previously included studies (Lertkhachonsuk 2009a; Rahimi‐Moghaddam 2004; Osborne 2011a); one record was added to 'Ongoing studies' section (GOG 0275). Previously included non‐RCTs (Abrao 2008; Kohorn 1996; Smith 1982; Wong 1985) were excluded. Conclusions updated.
14 February 2012	New search has been performed	Electronic database search updated rendering 964 records after de‐duplication.
27 January 2008	New citation required and major changes	Substantive amendment