| Date | Event | Description |
|---|---|---|
| 4 August 2008 | Amended | Converted to new review format. |
| 26 April 2006 | New search has been performed | In this updated review we excluded several previously included non‐randomised trials to reduce bias. We added several new, or newly identified, randomised controlled trials (RCTs), resulting in a review of 306 participants from 12 RCTs. |
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