| Date | Event | Description |
|---|---|---|
| 18 March 2016 | New citation required but conclusions have not changed | Search updated. One new study included. Review amended to reflect current Cochrane standards. 'Risk of bias' assessments and 'Summary of findings' table added. New author joined the review team. No change to conclusions. |
| 18 March 2016 | New search has been performed | Search updated. One new study included. |
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