Gelfand, Joel M.
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Univ Penn, Perelman Sch Med, Ctr Dermatoepidemiol & Translat, Dept Dermatol,Ctr Clin Epidemiol & Biostat, Philadelphia, PA 19104 USA
Univ Penn, Perelman Sch Med, Ctr Pharmacoepidemiol Res & Training, Dept Biostat & Epidemiol,Ctr Clin Epidemiol & Bio, Philadelphia, PA 19104 USA Univ Penn, Perelman Sch Med, Ctr Pharmacoepidemiol Res & Training, Div Rheumatol,Ctr Clin Epidemiol & Biostat, Philadelphia, PA 19104 USA