[1] Copenhagen Univ Hosp Gentofte, Dept Dermato Allergol, Natl Allergy Res Ctr, Hellerup, Denmark
[2] Univ Copenhagen, Copenhagen, Denmark
[3] Univ Copenhagen, Bispebjerg & Frederiksberg Hosp, Dept Occupat & Environm Med, Copenhagen, Denmark
[4] Univ Copenhagen, Unit Social Med, Hosp Frederiksberg, Frederiksberg, Denmark
[5] Natl Res Ctr Working Environm, Copenhagen, Denmark
[6] Univ Osnabruck, Dept Dermatol Environm Hlth & Hlth Theory, Osnabruck, Germany
[7] Univ Osnabruck, Inst Interdisciplinary Dermatol Prevent & Rehabil, Osnabruck, Germany
[8] Gentofte Univ Hosp, Natl Allergy Res Ctr, Gentofte Hospitalsvej 20A,1 Sal, DK-2900 Hellerup, Denmark