Date	Event	Description
11 December 2020	Amended	Clarification message added to the Declarations of interest statement about the review's compliance with the Cochrane conflict of interest policy, which includes the relevant parts of the Cochrane Commercial Sponsorship Policy.
9 July 2016	New search has been performed	Searches rerun. Five additional studies were added to the included studies. Two additional studies excluded on full‐text basis.
9 July 2016	New citation required and conclusions have changed	Searches rerun. Five additional studies were added to the included studies. Two additional studies excluded on full‐text basis. New authors joined the review team. 'Summary of findings' tables added. Conclusions not changed.
24 July 2013	New search has been performed	Searches rerun. Twelve additional studies were added to the included studies and nine additional studies to the excluded studies.
24 July 2013	New citation required but conclusions have not changed	Searches rerun. Twelve additional studies were added to the included studies and nine additional studies to the excluded studies. Risk of bias was reassessed in all included trials. Conclusions not changed. Change in author team.