1. Allergy Clinic, Department of Dermatology and Allergy Copenhagen University Hospital – Herlev and Gentofte Copenhagen Denmark
2. Department of Clinical Microbiology Copenhagen University Hospital – Herlev and Gentofte Copenhagen Denmark
3. Department of Public Health, Section of General Practice and Research Unit for General Practice University of Copenhagen Copenhagen Denmark
4. Lægerne Hansen, Møller, Pelvig and Hjortlund Valby Denmark
5. Department of Clinical Medicine University of Copenhagen Copenhagen Denmark