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McCowan LM, Dekker GA, Chan E, Stewart A, Chappell LC, Hunter M, Moss-Morris R, North RA; SCOPE consortium.McCowan LM, et al.BMJ. 2009 Mar 26;338:b1081. doi: 10.1136/bmj.b1081.BMJ. 2009.PMID: 19325177Free PMC article.