Date	Event	Description
23 February 2015	New search has been performed	The searches were updated on 23rd February 2015.
23 February 2015	New citation required but conclusions have not changed	Three new studies have been included (identified from a search carried out in September 2013); however the conclusions remain unchanged. A pre‐publication search carried out on 23rd February 2015 identified two potentially relevant studies (Klinkenberg 2014; NCT02089243 2014). These will be addressed at the next update.