| Date | Event | Description |
|---|---|---|
| 15 September 2016 | New search has been performed | Searches rerun. Six new studies included, five new studies excluded and one ongoing study identified. |
| 15 September 2016 | New citation required but conclusions have not changed | Searches rerun. Six new studies included, five new studies excluded and one ongoing study identified. Review updated according to current Cochrane standards. New authors have taken over this review. Conclusions not changed. |
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