Date	Event	Description
14 February 2016	Amended	typo's changed, final check up.
15 November 2015	Feedback has been incorporated	See Feedback 1 1. Redo the overall analysis ‘use vs non‐use’ based on adjusted effect estimates. 2. Redo the analyses per generation based on standard meta‐analytic techniques using adjusted estimates. We abandoned therefore the network meta‐analysis as presented in the first version of this review. Conclusion adapted accordingly.