| Date | Event | Description |
|---|---|---|
| 13 January 2014 | New citation required but conclusions have not changed | No new trials fulfilled the inclusion criteria of this review. |
| 13 January 2014 | New search has been performed | Searches were updated January 2014, but no new trials were identified for inclusion in the review. New trials are unlikely to be published in the following four years. The review has been updated based on current methods described in the Cochrane Handbook for Systematic Reviews of Interventions (Higgins 2011a). |
| 13 January 2012 | Amended | AE Junker is the new, lead author of this first review update. |
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