Date	Event	Description
30 March 2015	New search has been performed	Search updated. Methods updated. 'Summary of findings' tables have been incorporated for this update.
30 March 2015	New citation required but conclusions have not changed	Three new studies have been included in this update (Hakimi 1999; Sun 2010; West 2011). The review now includes a total of 19 studies. The conclusions remain the same.
15 February 2011	Amended	Authors of the Kirkwood 2010 trial provided additional information about the loss to follow up figure for the pregnancy‐related mortality analysis, which was 8% and not 44%.