Affiliation: | The Allergy Institute Voksentoppen, and The Allergy Unit. Pediatric Research Institute. Rikshospitalet. University of Oslo, Norway;Department of Allergy and II Department of Pediatrics. University- Central Hospital, Helsinki, Finland;Section for Occupational Allergy, Sahlgrenska Sjukhuset, University of Gothenburg, Sweden;Division of Allergy, Medical Department TA, Rigshospitalet, University of Copenhagen, Denmark |