| Date | Event | Description |
|---|---|---|
| 29 May 2019 | New search has been performed | Search updated 11 February 2019. |
| 28 May 2019 | New citation required but conclusions have not changed | Updated with inclusion of four new studies. Three ongoing unpublished studies identified. |
| 27 March 2014 | Amended | Contact details updated. |
| 21 June 2012 | New citation required and conclusions have changed | One new trial (Vergote 2010) included. Conclusions changed. |
| 21 June 2012 | New search has been performed | Search updated; 26 newly identified reports added to studies awaiting classification, including five reports of three ongoing studies (CHORUS #a; Kumar #a; Onda #a). |
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