Date	Event	Description
15 October 2012	New search has been performed	We updated the searches and included four new trials. There are now six included trials with a total of 223 participants. We have added a stricter definition of the inclusion criteria and outcome measures. There is also a newly added assessment of long‐term effects. The conclusions have not changed since the last version was published
15 October 2012	New citation required but conclusions have not changed	New first author