[1] Univ Washington, Sch Med, Seattle, WA USA
[2] Seattle Childrens Hosp, Dept Pediat, Div Rheumatol, Seattle, WA USA
[3] Seattle Childrens Res Inst, Ctr Clin & Translat Res, Childrens Core Biomed Stat, Seattle, WA USA
[4] Seattle Childrens Hosp, Dept Pediat, Div Dermatol, 4800 Sand Point Way NE,M-S OC-9-835, Seattle, WA 98105 USA