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238-9(July 2007)6615<m:linebreak></m:linebreak>LR: 20071115; JID: 7910653; CON: Am J Epidemiol. 2006 Jun 15;163(12):1149-56. PMID: 16624967; 2007/05/25 aheadofprint; ppublish;<m:linebreak></m:linebreak>Propensity score.