Date	Event	Description
19 August 2015	Review declared as stable	The authors and editors agreed to re‐assess this review for further updating in 2018.
5 March 2015	New citation required and conclusions have changed	The additional data and the new approach to summarizing and interpreting results have altered the conclusions of this review. Readers may wish to re‐read this review update.
3 March 2015	New search has been performed	This review has been updated to include the results of a new search. 518 unique citations were screened, Data from one new study for a new comparison and data for a secondary outcome (local recurrence) from two studies were added. This review update also includes risk of bias tables, and summary of findings tables.
17 December 2013	New search has been performed	Search updated; 501 reports were not relevant, one RCT added to included studies; one study awaits assessment; eight reports added to excluded studies; six additional citations added to previously included studies. Mhoira Leng left review team.
9 November 2009	Amended	Contact details updated.
27 August 2008	Amended	Contact details updated