[1] Northwestern Univ, Feinberg Sch Med, Dermatol Prevent Med & Med Social Sci, Chicago, IL 60611 USA
[2] Univ Penn, Perelman Sch Med, Dermatol, Philadelphia, PA 19104 USA
[3] Univ Colorado, Sch Med, Allergy & Immunol, Denver, CO USA
[4] Ohio State Univ, Allergy & Immunol, Columbus, OH 43210 USA
[5] Oregon Hlth & Sci Univ, Dermatol, Portland, OR USA
[6] Univ Southern Calif, Keck Sch Med, Allergy & Immunol, Los Angeles, CA USA