[1] Oxford Univ Hosp Trust, Dept Dermatol, Oxford OX3 7LJ, England
[2] PD Hinduja Natl Hosp & Med Res Ctr, Dept Dermatol, Bombay, Maharashtra, India
[3] Sir HN Reliance Fdn Hosp, Dept Dermatol, Bombay, Maharashtra, India
[4] Dartmouth Coll, Dept Obstet & Gynecol, Geisel Sch Med, Hanover, NH 03755 USA
[5] Dartmouth Coll, Dept Surg Dermatol, Geisel Sch Med, Hanover, NH 03755 USA