Date	Event	Description
2 September 2017	New citation required but conclusions have not changed	The addition of 5 new studies and additional data from one further study have not led to a change in the conclusions of this review
2 September 2017	New search has been performed	New searches from 1 March 2015 to 1 June 2017 identified 5 additional studies (Do 2005; Gan 2017; Vercellini 1989; Wang 2016; Xiao 2015). We updated the data of Lin 2015b which were partially presented in the previous review as Lin 2013. Amer 2010 and Fuchs 2014 were re‐classified under the comparison "Any therapy versus any other therapy" in the updated version.