Halpern, S. D.
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Univ Penn, Clin Ctr Biostat & Epidemiol, Philadelphia, PA 19104 USA
Univ Penn, Leonard Davis Inst Hlth Econ, Philadelphia, PA 19104 USA
Univ Penn, Div Pulm Allergy & Crit Care, Dept Med, Philadelphia, PA 19104 USA Univ Penn, Div Gastroenterol, Dept Med, Philadelphia, PA 19104 USA