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. Author manuscript; available in PMC: 2015 Jan 22.
Published in final edited form as: Cochrane Database Syst Rev. 2009 Jan 21;(1):CD007324. doi: 10.1002/14651858.CD007324.pub2
16 June 2010 Amended External source of support added.
10 February 2009 Amended A reference has been added for the SCORE study.