1. Department of Dermatology and Allergy, Copenhagen University Hospital – Herlev and Gentofte, Copenhagen, Denmark
2. Centre for General Practice, The Research Unit for General Practice Slagelse/Copenhagen, and Section of General Practice, Department of Public Health, University of Copenhagen, Copenhagen, Denmark
3. National Allergy Research Center, Copenhagen University Hospital – Herlev and Gentofte, Copenhagen, Denmark
4. Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
5. Department of Dermatology and Venereology, Copenhagen University Hospital – Bispebjerg and Frederiksberg, Copenhagen, Denmark
6. Department of Pediatrics, Copenhagen University Hospital – Herlev and Gentofte, Copenhagen, Denmark