Date	Event	Description
2 August 2013	New citation required but conclusions have not changed	Conclusions remain unchanged
2 August 2013	New search has been performed	Third update, new searches. Two new studies included (Kalemikerakis 2012; Lund‐Nielsen 2011a). Four additional studies excluded (Ingle 2006; Lo 2012; Lund‐Nielsen 2008; Lund‐Nielsen 2011).