Date	Event	Description
20 June 2017	New citation required but conclusions have not changed	Searches were rerun. Two new studies were included. Nine additional studies were excluded. New authors joined review team. 'Risk of bias' and 'Summary of findings' tables added. Conclusions not changed.
20 June 2017	New search has been performed	Searches were rerun. Two new studies were included. Nine additional studies were excluded.
4 September 2013	New search has been performed	Searches were rerun. No new studies were included. Five additional studies were excluded. One ongoing study added.
4 September 2013	New citation required but conclusions have not changed	Searches were rerun. No new studies were included. Five additional studies were excluded. One ongoing study added. Minor edits made. One new author joined review team. Conclusions not changed.
14 February 2011	Amended	Link to anticoagulant feedback added
10 November 2008	Amended	Amendment to Plain language summary at the request of the authors. Amendments to contact details of two authors.
18 July 2008	Amended	Converted to new review format.