[1] Univ Penn, Dept Dermatol, Perelman Sch Med, 3400 Civ Ctr Blvd,South Tower,Seventh Floor, Philadelphia, PA 19104 USA
[2] Geisinger Commonwealth Sch Med, Scranton, PA USA
[3] Univ Penn, Mixed Methods Res Lab, Perelman Sch Med, Philadelphia, PA USA
[4] Univ Penn, Dept Family Med & Community Hlth, Perelman Sch Med, Philadelphia, PA USA
[5] Univ Penn, Dept Biostat Epidemiol & Informat, Ctr Clin Epidemiol & Biostat, Perelman Sch Med, Philadelphia, PA USA