1. Allergology Department; Centro Hospitalar do Porto; Porto Portugal
2. Division Environmental Dermatology and Allergology Helmholtz Zentrum München/TUM; Department of Dermatology und AllergologyBiederstein; Technical University Munich; Munich Germany
3. Department of Pediatric Allergy and Clinical Immunology; Faculty of Medicine; Mersin University; Mersin Turkey
4. Pediatric Department; Hospital of Palmanova; A.S.S.5 ‘Bassa Friulana’; Palmanova UD Italy
5. Allergy Unit; Department of Pediatric; Anna Meyer Children's Hospital; University of Florence; Florence Italy
6. Allergy Department; Infanta Leonor University Hospital; Madrid Spain
7. Division of Pediatric Dermatology; Children's Hospital Auf der Bult; Hannover Germany
8. University Children's Hospital of Belgrade; Medical Faculty University of Belgrade; Belgrade Serbia
9. Allergy and Clinical Immunology Unit and Institute for Pediatric Pulmonology and National CF Center; Safra Children's Hospital; Tel Hashomer Israel
10. Division of Pediatric Allergy; University Hospital of Geneva; Geneva Switzerland
11. Department of ENT and Pediatrics; AMC; Amsterdam The Netherlands