Date	Event	Description
5 October 2020	New search has been performed	Review authors have updated the Cochrane Review
5 October 2020	New citation required but conclusions have not changed	The addition of 8 trials has not led to a change in Review conclusions (Abulsoud 2019; Elnahas 2017; González‐Ortega 2015; Nada 2018; Razi 2013; Safari 2017; Shi 2016; Wan 2014)
30 May 2013	Amended	Minor correction to review title (format only)
8 August 2012	New citation required but conclusions have not changed	Seven new studies added; no change to conclusions
8 August 2012	New search has been performed	Review updated August 2012. Seven new studies in this update (Balakier 2009; Fang 2010; Ge 2008; Germond 2004; Hagemann 2010; Kutlu 2010; Valojerdi 2010)
17 June 2008	New search has been performed	New search identified 4 new randomised controlled trials, which have been added. Conclusions have not changed
15 May 2008	Amended	Converted to new review format
18 September 2007	New citation required and conclusions have changed	Substantive amendments made