[1] Univ Copenhagen, Dept Dermatol & Allergy, Allergy Clin, Hosp Herlev & Gentofte, Copenhagen, Denmark
[2] Univ Copenhagen, Dept Clin Microbiol, Hosp Herlev & Gentofte, Copenhagen, Denmark
[3] Univ Copenhagen, Dept Publ Hlth, Sect Gen Practice, Copenhagen, Denmark
[4] Univ Copenhagen, Res Unit Gen Practice, Copenhagen, Denmark
[5] Laegerne Hansen Moller Pelvig & Hjortlund, Valby, Denmark
[6] Univ Copenhagen, Dept Clin Med, Copenhagen, Denmark
[7] Univ Copenhagen, Dept Dermatol & Allergy, Allergy Clin, Hosp Herlev & Gentofte, Gentofte Hospitalsvej 8-1 sal, DK-2900 Hellerup, Denmark