Date	Event	Description
6 November 2017	New search has been performed	The review has been updated. We conducted a new search on 6 November 2017. We included 16 new studies in the 2018 update ( Amer 2017; Chen 2016; El‐Gharib 2015; El‐Khayat 2016; Ghahiri 2016; Ghomian 2015; Hassan 2017; Hendawy 2011; Ibrahim 2017; Liu 2015; Liu 2017; Moussa 2016; Seyedoshohadaei 2016; Sharief 2015; Wu 2016; Zarei 2015). We added one study as ongoing (NCT03009838).
6 November 2017	New citation required but conclusions have not changed	There is no change to the conclusions of this review.
24 September 2014	Amended	This review has been amended. A new search was conducted on 18 September 2014 and new ongoing studies added.
17 July 2014	Amended	Addition of new data made available for Legro 2014. New secondary outcome has been added: miscarriage rate per pregnancy
26 February 2014	Amended	Correction of search date in Abstract and Methods sections