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Durham VA Hlth Care Syst, Durham VA Med Ctr, Cooperat Studies Program Epidemiol Ctr Durham, Durham, NC 27705 USA
Duke Univ, Sch Med, Durham Ctr Hlth Serv Res Primary Care, Durham VA Med Ctr,Durham VA Hlth Care Syst,Gen In, Durham, NC USA
Duke Univ, Sch Med, Dept Med, Div Gastroenterol, Durham, NC 27706 USA Durham VA Hlth Care Syst, Durham VA Med Ctr, Cooperat Studies Program Epidemiol Ctr Durham, Durham, NC 27705 USA