Date	Event	Description
2 May 2013	New search has been performed	The searches identified: a full paper publication to an already included study (Bishop 2011); four additional references to an already excluded study (Bakker 2011); and one new excluded study (Lahiri 2012). A further six trials (15 trials reports) identified were disregarded from inclusion on title alone.
2 May 2013	New citation required but conclusions have not changed	Minor changes have been made throughout this updated version of the review.