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