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. Author manuscript; available in PMC: 2014 Sep 27.
Published in final edited form as: Cochrane Database Syst Rev. 2008 Oct 8;(4):CD004771. doi: 10.1002/14651858.CD004771.pub3
20 June 2008 New citation required and major changes New authors have taken over this title and brought the protocol up to date
23 May 2008 Amended Converted to new review format.