| Date | Event | Description |
|---|---|---|
| 15 May 2012 | New citation required but conclusions have not changed | Review updated. Eight new trials included and incorporated into the review, but conclusions not changed. We updated the search of the Cochrane Pregnancy and Childbirth Group's Trials Register on 30 April 2013 and added the results to the awaiting classification section of the review, to be assessed at the next update in December 2013. |
| 31 January 2012 | New search has been performed | Search updated. |
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