Date	Event	Description
2 July 2009	Amended	Subheadings in result section activated and Cindy Farquhar included as co‐author. Background and parts of the protocol have been rewritten to accommodate the new Revman subheadings but no major methodological changes were made. The study search was extended through July, 2009
26 May 2009	Amended	Converted to new review format.
18 July 2007	New citation required and conclusions have changed	Substantive amendment