Date	Event	Description
27 October 2017	Amended	Some errors were noted in Figure 7 and Figure 19 where we have presented the fixed‐effect model rather than the random‐effects model as stated in the text. This was corrected. Some of the calculations for the Summary of findings table 1 were also based on the fixed‐effect model rather than the random‐effects model. This has now been corrected. None of the corrected errors require further changes within the review text.