Date	Event	Description
4 August 2010	New citation required but conclusions have not changed	Six new trials were added to the review.
29 June 2010	New search has been performed	This review was updated: the list of authors was changed, six new trials were included, the Background section was changed, the Methods section was modified according the Cochrane Handbook for Systematic Reviews of Interventions (Higgins 2009), the discussion was modified. The primary outcomes were arranged to include quality of life and adverse events as primary outcomes in concordance with the Cochrane Handbook for Systematic Reviews of Interventions (Higgins 2009).