| Date | Event | Description |
|---|---|---|
| 17 December 2012 | New search has been performed | Study added to 'awaiting classification' (Espey 2012). |
| 2 November 2010 | New search has been performed | Searches were updated for MEDLINE, CENTRAL, and POPLINE. New searches were added for ClinicalTrials.gov and ICTRP. No new trials met the inclusion criteria. |
| 7 May 2008 | New search has been performed | Searches were updated; no new trials were found. |
| 3 October 2005 | New citation required and conclusions have changed | Substantive amendment |
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