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机构:
Harvard Med Sch, Brigham & Womens Hosp, Ctr Crohns & Colitis, Boston, MA 02115 USA
Univ Southern Denmark, Odense Univ Hosp, Ctr Clin Epidemiol, Odense, Denmark
Univ Southern Denmark, Res Unit Clin Epidemiol, Odense, Denmark Harvard Med Sch, Brigham & Womens Hosp, Ctr Crohns & Colitis, Boston, MA 02115 USA