[1] Univ Penn, Perelman Sch Med, Philadelphia, PA 19104 USA
[2] Botswana UPenn Partnership, Gaborone, Botswana
[3] Univ Penn, Daris Duke Clin Res Fellowship Prog, Philadelphia, PA 19104 USA
[4] Childrens Hosp Philadelphia, Philadelphia, PA USA
[5] Univ Penn, Dept Dermatol, Philadelphia, PA 19104 USA