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T. Stukel, E. Fisher, D. Wennberg, D. Alter, D. Gottlieb, and M. Vermeulen. JAMA : the journal of the American Medical Association, 297 (3):
278-85(January 2007)4085<m:linebreak></m:linebreak>LR: 20070518; PUBM: Print; GR: 1P01-AG19783-01/AG/NIA; JID: 7501160; CIN: JAMA. 2007 Jan 17;297(3):314-6. PMID: 17227985; CIN: JAMA. 2007 May 16;297(19):2077-8; auhor reply 2078. PMID: 17507341; CIN: JAMA. 2007 May 16;297(19):2077; auhor reply 2078. PMID: 17507342; ppublish;<m:linebreak></m:linebreak>Variables instrumentals.