Gelfand, Joel M.
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Univ Penn, Dept Dermatol, Perelman Sch Med, Philadelphia, PA 19104 USA
Univ Penn, Dept Epidemiol & Biostat, Ctr Clin Epidemiol & Biostat, Perelman Sch Med, Philadelphia, PA 19104 USA Univ Penn, Dept Dermatol, Perelman Sch Med, Philadelphia, PA 19104 USA