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机构:
Yale Sch Med, Dept Internal Med, Sect Gen Internal Med, New Haven, CT USA
Yale Sch Publ Hlth, Publ Hlth Modeling Unit, New Haven, CT USA
Yale Sch Med, Program Addict Med, New Haven, CT USA UNC Gillings Sch Global Publ Hlth, Dept Epidemiol, 105C McGavran Greenberg Hall CB 7435, Chapel Hill, NC 27599 USA