| Date | Event | Description |
|---|---|---|
| 21 August 2013 | New search has been performed | For this first update one additional study included (Vishwanath 2011). Dr Lubbers is no longer involved as an author. Dirk Ubbink assumes the role of contact person for this review. |
| 21 August 2013 | New citation required but conclusions have not changed | New search. No change to conclusions of the review. |
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