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机构:
Univ Michigan, Sch Med, Dept Internal Med, Ann Arbor, MI 48109 USA
Univ Michigan, Sch Med, Dept Gastroenterol, Ann Arbor, MI 48109 USA
Veteran Affairs Ctr Excellence Hlth Serv, Ann Arbor, MI USA Univ Michigan, Sch Med, Dept Internal Med, Ann Arbor, MI 48109 USA