| Date | Event | Description |
|---|---|---|
| 9 December 2013 | New search has been performed | We updated the searches on 9 December 2013. A pre‐publication search was carried out on 26 October 2015. The authors will address these search results at a later stage. It is extremely unlikely that these results will change the existing conclusions. |
| 9 December 2013 | New citation required but conclusions have not changed | Two new studies have been included, and two authors (one original author, PB, and one new author, NF) have extensively re‐written the review to fit the new review format. The conclusions remain unchanged. |
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