| Date | Event | Description |
|---|---|---|
| 7 April 2011 | New search has been performed | Searches conducted. No new trials were identified for inclusion. One trial was excluded in this update (Wazib 2008). Our conclusions remain unchanged |
| 28 June 2008 | Amended | Converted to new review format. |
| 21 August 2007 | New search has been performed | In this 2007 updated review, a new study from Niger has been added to the review. Overall conclusions remain the same. |
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