| Date | Event | Description |
|---|---|---|
| 5 June 2019 | New citation required but conclusions have not changed | The findings in this update are consistent with those reported previously (Steingart 2014). |
| 5 June 2019 | New search has been performed | The review authors identified 95 unique studies, integrating 77 new studies since publication of the Cochrane Review (Steingart 2014). |
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