| Date | Event | Description |
|---|---|---|
| 12 December 2017 | New search has been performed | This is the first update of the Cochrane Review published in 2012. We updated the searches to May 2017 and the methods to comply with Cochrane's MECIR standards. We added a new author. |
| 12 December 2017 | New citation required but conclusions have not changed | We found one new study; the review now includes four studies. |
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