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机构:
Western Univ, Schulich Sch Med & Dent, Dept Epidemiol & Biostat, London, ON, Canada
Univ Bern, Inst Social & Prevent Med, Bern, Switzerland
Western Univ, Schulich Sch Med & Dent, Dept Paediat, London, ON, Canada Hlth Canada, Environm Hlth Sci & Res Bur, Ottawa, ON, Canada