Date	Event	Description
20 October 2014	New search has been performed	Search updated. We included a further publication on one of the already included studies and now include data on after‐pains for this comparison (Jangsten 2011). We updated the risk of bias for all included studies to assess both performance bias and detection bias. We have included a 'Summary of findings' table in this update.
20 October 2014	New citation required but conclusions have not changed	Three references identified and one included for this update (a new paper from a trial already included) and two were excluded.
17 August 2011	New citation required but conclusions have not changed	Deirdre Murphy and Susan MacDonald stepped down as authors. Andrew Weeks joined the team.
17 August 2011	New search has been performed	Search updated in February 2011: two new studies included (Jangsten 2011; Jerbi 2007); four excluded (Abdel‐Aleem 2010; Hoffman 2006; Ramirez 2001; Vasegh 2005); and one added to Studies awaiting classification. Protocol section updated ‐ seeDifferences between protocol and review.
10 May 2010	Feedback has been incorporated	Feedback on the previous version of this review added, along with replies from the new review team.