[1] Univ Penn, Dept Dermatol, Hosp Univ Penn, Perelman Sch Med, Philadelphia, PA 19104 USA
[2] Childrens Hosp Philadelphia, Dept Pediat, Sect Pediat Dermatol, Philadelphia, PA 19104 USA
[3] Childrens Hosp Philadelphia, Dept Pathol & Lab Med, Philadelphia, PA 19104 USA
[4] Sungkyunkwan Univ, Samsung Med Ctr, Dept Dermatol, Seoul, South Korea
[5] Nail Dis Ctr, Dermatol, Cannes, France