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机构:
Michael E DeBakey VA Med Ctr, Dept Med, Sect Gastroenterol & Hepatol, Houston, TX USA
Baylor Coll Med, Dept Med, Michael E DeBakey VA Med Ctr, Houston, TX 77030 USA
Baylor Coll Med, VA HSR&D Ctr Innovat Qual Effectiveness & Safety, Michael E DeBakey VA Med Ctr, Sect Hlth Serv Res, Houston, TX 77030 USA Univ North Texas Hlth Sci Ctr, Dept Epidemiol, Ft Worth, TX USA