[1] Mayo Clin, Dept Dermatol, Rochester, MN USA
[2] Mayo Clin, Dept Pediat, Rochester, MN USA
[3] Univ Toronto, Dept Med, Div Dermatol, Toronto, ON, Canada
[4] Womens Coll Hosp, Womens Coll, Res Inst, Toronto, ON, Canada
[5] Sutter Med Fdn, Dept Dermatol, Sacramento, CA USA
[6] Brown Univ, Dept Dermatol, Warren Alpert Med Sch, Providence, RI 02912 USA
[7] NYU, Ronald O Perelman Dept Dermatol, New York, NY USA
[8] Natl Jewish Hlth, Dept Pediat, Denver, CO USA
[9] Univ Calif San Diego, San Diego, CA 92103 USA
[10] Rady Childrens Hosp, Div Pediat & Adolescent Dermatol, San Diego, CA USA
[11] Amer Acad Dermatol, 9500 Bryn Mawr Ave,Suite 500, Rosemont, IL 60018 USA
[12] Northwestern Univ, Dept Dermatol, Feinberg Sch Med, Chicago, IL 60611 USA
[13] Northwestern Univ, Dept Pediat, Feinberg Sch Med, Chicago, IL 60611 USA
[14] George Washington Univ, Dept Dermatol, Sch Med & Hlth Sci, Washington, DC USA
[15] Univ Wisconsin, Dept Pediat, Sch Med & Publ Hlth, Madison, WI USA
[16] Univ Washington, Div Dermatol, Dept Pediat, Sch Med, Seattle, WA 98195 USA
[17] Seattle Childrens Hosp, Seattle, WA USA