| Date | Event | Description |
|---|---|---|
| 31 May 2019 | New search has been performed | The review has been updated |
| 31 May 2019 | New citation required and conclusions have changed | The review has been updated according to Cochrane's current methodological standards. No new studies have been added as a result of new searches. However, many sections of the review including the conclusions have been substantively updated. |
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