[1] Yale Univ, Dept Dermatol, Sch Med, 333 Cedar St, New Haven, CT 06510 USA
[2] Univ Penn, Perelman Sch Med, Dept Dermatol, 3400 Civ Ctr Blvd, Philadelphia, PA 19104 USA
[3] Harvard Med Sch, Massachusetts Gen Hosp, Dept Dermatol, 55 Fruit St, Boston, MA 02114 USA