Sanna M Edelman1,2, Anna Kaarina Kukkonen3, Mika J Mäkelä2,3. 1. Allergen Laboratory, Skin and Allergy Hospital, Helsinki University Central Hospital, Helsinki, Finland. 2. Department of Dermatology, Allergology and Venereology, University of Helsinki, Helsinki, Finland. 3. Pediatric Department, Skin and Allergy Hospital, Helsinki University Central Hospital, Helsinki, Finland.