[1] Mayo Clin, Dept Dermatol, Rochester, MN USA
[2] Univ Calif Davis, Sch Med, Sacramento, CA 95817 USA
[3] Republ Univ Uruguay, Dept Dermatol, Montevideo, Uruguay
[4] Univ So Denmark, Odense Univ Hosp, Dept Dermatol, Odense, Denmark
[5] Univ Southern Denmark, Odense Univ Hosp, Allergy Ctr, Odense, Denmark
[6] Lund Univ, Skane Univ Hosp Malmo, Dept Occupat & Environm Dermatol, Malmo, Sweden
[7] Seoul Natl Univ, Coll Med, Dept Dermatol, Seoul, South Korea
[8] Univ Hosp KU Leuven, Dept Dermatol, Contact Allergy Unit, Leuven, Belgium
[9] Natl Skin Ctr, Singapore 1130, Singapore
[10] Catholic Univ Louvain, Brussels, Belgium
[11] St Thomas Hosp, St Johns Inst Dermatol, London, England
[12] Skin & Canc Fdn Victoria, Occupat Dermatol Res & Educ Ctr, Melbourne, Vic, Australia
[13] McGill Univ, Ctr Hlth, Div Dermatol, Montreal, PQ, Canada
[14] Univ Calif San Francisco, Sch Med, Dept Dermatol, San Francisco, CA 94143 USA