Date	Event	Description
30 June 2016	New search has been performed	Search updated 30 June 2016 and one new study was identified and excluded. We updated and rearranged the Background under the standard headings. We have also rearranged the 'Risk of bias' assessment under standard headings. This resulted in a decision to move one study previously in our qualitative analysis, to our quantitative analysis. We selected outcomes for inclusion in a 'Summary of findings' table and included the 'Summary of findings' table in this updated version of the review. We rewrote the Plain language summary in a structured format. We also corrected a typographical error in our feedback to Di Mario et al.
30 June 2016	New citation required but conclusions have not changed	For this update we identified one new trial report, which we excluded (Feldens 2013).