| Date | Event | Description |
|---|---|---|
| 5 October 2016 | New search has been performed | Search re‐run. Three new studies included, 12 new studies excluded and nine ongoing studies identified |
| 5 October 2016 | New citation required but conclusions have not changed | Search re‐run. Three new studies included, 12 new studies excluded and nine ongoing studies identified. Risk of bias and Summary of Findings table added. Text updated in keeping with current Cochrane guidelines. No changes to conclusions |
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