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Univ Penn, Dept Med, Perelman Sch Med, Philadelphia, PA 19104 USA
Univ Penn, Dept Dermatol, Perelman Sch Med, Philadelphia, PA 19104 USA
Univ Penn, Dept Biostat, Perelman Sch Med, Philadelphia, PA 19104 USA
Univ Penn, Dept Epidemiol, Perelman Sch Med, Philadelphia, PA 19104 USA Univ Massachusetts, Sch Med, Dept Orthoped & Phys Rehabil, 55 Lake Ave North, Worcester, MA 01655 USA