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机构:
Western Univ, Rotman Inst Philosophy, London, ON, Canada
Ottawa Hosp, Res Inst, Clin Epidemiol Program, Ottawa, ON, Canada
Univ Ottawa, Dept Epidemiol & Community Med, Ottawa, ON, Canada Univ Calgary, Dept Emergency Med, Foothills Med Ctr, 1403 29th St NW, Calgary, AB T2N 2T9, Canada