[1] Univ Michigan, Dept Dermatol, Sch Med, Ann Arbor, MI 48109 USA
[2] Northwestern Univ, Feinberg Sch Med, Chicago, IL 60611 USA
[3] Ann & Robert H Lurie Childrens Hosp, Div Pediat Dermatol, Chicago, IL USA
[4] Oregon Hlth & Sci Univ, Portland, OR 97201 USA
[5] Univ Calif San Diego, Sch Med, Rady Childrens Hosp, San Diego, CA 92103 USA