[1] Univ Louisville, Dermatol, Sch Med, Louisville, KY USA
[2] Beijing Childrens Hosp, Dermatol, Beijing, Peoples R China
[3] Dermatology, Bellevue, WA USA
[4] Childrens Hosp Los Angeles, Los Angeles, CA USA
[5] Univ Liverpool Liverpool Sch Trop Med, Ctr Childbirth Womens & Newborn Hlth, Liverpool, England
[6] Univ Calif San Diego, Dept Dermatol, San Diego, CA USA
[7] Univ Calif San Diego, Dept Pediat, San Diego, CA USA
[8] Rady Childrens Hosp, San Diego, CA USA
[9] Dermatol North Carolina, High Point, NC USA
[10] Univ Sheffield, Div Clin Med, Sheffield Dermatol Res, Med Sch, Sheffield, England
[11] Univ Sheffield, Sheffield Childrens Hosp, Sheffield Dermatol Res, Beech Hill Rd, Sheffield S10 2RX, England