Date	Event	Description
30 September 2011	New citation required and conclusions have changed	New trials were added and the review was edited accordingly: the conclusion on primary outcome delivery before 24 hours has changed, partly due to change in statistical method (random‐effects model, due to substantial heterogeneity). Also, some conclusions on secondary outcome measures have changed. We updated the search on 16 January 2012 and added the results to Studies awaiting classification for consideration in the next update.
30 April 2011	New search has been performed	Search updated. We have included 27 new studies and excluded 28 new studies. One trial (previously included) has now been reclassified as excluded (Abramovici 1999). Four new ongoing studies have also been identified (Hallak 2008a; Jozwiak 2009a; Lin 2006a; Manyonda 2007a).
18 September 2008	Amended	Converted to new review format.