| Date | Event | Description |
|---|---|---|
| 5 January 2012 | New search has been performed | Issue 2, 2012: Electronic searches were updated, risk of bias tables have been completed for all included trials and text modified. A new author joined the review team to assist with updating the review. |
| 5 January 2012 | New citation required but conclusions have not changed | Issue 2, 2012: Two new trials were included in the update (Abdou 2010; Stoller 2011). |
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