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机构:
Univ Western Ontario, Dept Med, London, ON, Canada
Univ Western Ontario, Dept Epidemiol, London, ON, Canada
Univ Western Ontario, Dept Biostat, London, ON, Canada
Univ Western Ontario, Robarts Res Inst, London, ON, Canada Mayo Clin, Coll Med, Div Gastroenterol, Rochester, MN USA