| Date | Event | Description |
|---|---|---|
| 30 June 2017 | New search has been performed | Literature search run. |
| 30 June 2017 | New citation required but conclusions have not changed | One new study included in the review. Addition of author. Review updated to reflect current Cochrane methods including addition of 'Summary of findings' table and PRISMA flow chart. See Differences between protocol and review. |
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