Date	Event	Description
2 February 2012	New search has been performed	One new trial was identified and included in the review. The outcomes and risk of bias table were modified following the Cochrane Handbook for Systematic Reviews of Interventions (Higgins 2011).
2 February 2012	New citation required but conclusions have not changed	Adding data from one trial (Guo 2010) did not change the conclusions of the review published earlier (Gurusamy 2009).