Date	Event	Description
15 August 2016	New citation required but conclusions have not changed	Thirteen trials added for this update. This update includes a total of 23 studies. Conclusions remain the same.
15 August 2016	New search has been performed	Search updated: 13 new studies included (Agarwal 2012; Guha 2015; Haghighi 2013; Haghighi 2015; Krishnamurthy 2015; Movahed 2016; Razaq 2011; Rezk 2014; Romero‐Gutierrez 2011; Schmitz 2014; Soliman 2013; Vidanagamage 2011; Yazdizadeh 2013) and four excluded (Abdellah 2011; Ahmed 2014; El‐Khayat 2016; Ziard 2012). One study previously in awaiting classification has been excluded in this update (Vaisanen‐Tommiska 2008). A 'Summary of findings' table was added for this update.