1. Department of Dermatology und Allergology Biederstein; Division Environmental Dermatology and Allergology Helmholtz Zentrum München/TUM; Technical University Munich; Munich; Germany
2. Allergy Clinic; Copenhagen University Hospital; Gentofte; Denmark
3. Department of Dermatology; Medical University of Graz; Graz; Austria
4. University Children's Hospital; Medical Faculty University of Belgrade; Belgrade; Serbia
5. Dermatology Department and EA 72-98 INGRES; Brabois Hospital; University Hospital of Nancy; Lorraine University; Vandoeuvre les Nancy; France
6. Department of Immunology, Allergy and Respiratory Diseases; Allergy Unit; University Hospital Ospedali Riuniti; Ancona; Italy
7. Dermatologische Universitätsklinik Kantonsspital; Basel; Switzerland
8. Allergy Service; Carlos Haya Hospital; Malaga; Spain
9. Allergy Unit; Verona University Hospital; Verona; Italy
10. Allergy and Clinical Immunology Unit; San Giovanni di Dio Hospital; Florence; Italy
11. Department of Allergy and Clinical Immunology; Medical University; H. S. Joao; Porto; Portugal
12. Allergy Department; University Hospital of Montpellier and INSERM U657; Montpellier; France
13. Department of Immunology; Beaumont Hospital; Dublin; Ireland
14. Service d'anesthésie-réanimation chirurgicale; Hôpitaux Universitaires de Strasbourg; Strasbourg; France
15. Department of Allergy; Addenbrooke's Hospital; Cambridge; UK
16. Allergology and Oncology Service; Civil Hospital of Asola; Mantova; Italy
17. Allergy Unit; C. I. Columbus; Rome and IRCCS Oasi Maria S. S.; Troina; Italy
18. Department of Rheumatology; Clinical Immunology and Allergology; Bern; Switzerland
19. Department of Dermatology and Allergology; University of Würzburg; Würzburg; Germany
20. Department of ENT and Pediatrics; AMC; Amsterdam; The Netherlands