[1] Univ Calif San Francisco, San Francisco, CA 94143 USA
[2] Intermt Healthcare, Salt Lake City, UT USA
[3] Univ Wisconsin, Sch Med & Publ Hlth, Madison, WI USA
[4] Columbia Univ, Vagelos Coll Phys & Surg, New York, NY USA
[5] Northwestern Univ, Ann & Robert H Lurie Childrens Hosp Chicago, Feinberg Sch Med, Chicago, IL 60611 USA
[6] Univ Toronto, Hosp Sick Children, Toronto, ON, Canada
[7] Med Coll Wisconsin, Milwaukee, WI 53226 USA
[8] Univ Washington, Sch Med, Seattle Childrens Hosp, Seattle, WA USA
[9] Indiana Univ, Indianapolis, IN 46204 USA
[10] Mayo Clin, Rochester, MN USA
[11] Hosp St Joan de Deu, Barcelona, Spain
[12] Harvard Med Sch, Boston, MA 02115 USA
[13] Univ Missouri, Kansas City, MO 64110 USA
[14] Univ Montreal, St Justine Univ Hosp Ctr, Dept Pediat, Div Pediat Dermatol, Montreal, PQ, Canada
[15] Baylor Coll Med, Houston, TX 77030 USA
[16] Univ Minnesota, Minneapolis, MN USA