Asch, David A.
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Univ Penn, Sch Med, Ctr Clin Epidemiol & Biostat, Philadelphia, PA 19104 USA
Univ Penn, Sch Med, Dept Biostat & Epidemiol, Philadelphia, PA 19104 USA
Univ Penn, Sch Med, Div Gen Internal Med, Dept Med, Philadelphia, PA 19104 USA
Univ Penn, Sch Med, Leonard Davis Inst Hlth Econ, Philadelphia, PA 19104 USA
Philadelphia Vet Affairs Med Ctr, Ctr Hlth Equ Res & Promot, Philadelphia, PA USA Univ Penn, Sch Med, Ctr Clin Epidemiol & Biostat, Philadelphia, PA 19104 USA