Umscheid, C. A.
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机构:
Univ Penn, Perelman Sch Med, Ctr Evidence Based Practice, Philadelphia, PA 19104 USA
Univ Penn, Perelman Sch Med, Dept Biostat & Epidemiol, Philadelphia, PA 19104 USA
Univ Penn, Leonard Davis Inst Hlth Econ, Perelman Sch Med, Philadelphia, PA 19104 USA
Univ Penn, Perelman Sch Med, Ctr Clin Epidemiol & Biostat, Philadelphia, PA 19104 USA
Univ Penn, Perelman Sch Med, Div Gen Internal Med, Philadelphia, PA 19104 USA Duke Univ, Sch Med, Div Gastroenterol, Durham, NC USA