Date	Event	Description
29 May 2019	Amended	Contact details updated.
11 October 2017	Review declared as stable	No new studies likely to change the conclusions are expected.
20 April 2016	Review declared as stable	See Published notes.
28 October 2015	New search has been performed	New searches. One new study (43 participants) satisfied inclusion criteria (Calhoun 2014)
28 October 2015	New citation required but conclusions have not changed	The new study did not contribute data to any analyses. Minor changes were made to the Risk of bias assessment, in line with current standards.
20 December 2013	Amended	Minor changes made to definitions of 24‐hour outcomes and Use of rescue medication in Appendix 1, and 95% confidence intervals added to NNTs in Abstract