1. Allergy Unit; Department of Internal Medicine; University Hospital; Ancona Italy
2. Department of Pediatrics; Jagiellonian University Medical College; Krakow Poland
3. Immunology; Central Manchester University Hospitals; Manchester UK
4. Department of Allergology; GRIAC Research Institute; University of Groningen; University Medical Center Groningen; Groningen The Netherlands
5. Department of Pediatric Pulmonology and Allergy; Medical University of Warsaw; Warsaw Poland
6. Department of Dermatology and Allergology; Justus Liebig University Gießen; University Medical Center Gießen and Marburg GmbH; Gießen Germany
7. Allergy Unit; Azienda Ospedaliera Universitaria Integrata of Verona; Verona Italy
8. Allergy Service; Department of Clinical Medicine; Alicante University Hospital; UMH; Alicante Spain
9. University Clinic of Respiratory and Allergic Disease; Golnik Slovenia
10. Division of Allergology; University Clinic of Rheumatology, Immunology and Allergology; University Hospital/Inselspital; Bern Switzerland
11. Allergy Unit; Department of Dermatology and Allergy; Copenhagen University Hospital Gentofte; Hellerup Denmark
12. Department of Internal Medicine, Allergy and Clinical Immunology; Silesian University of Medicine; Katowice Poland
13. Department of Allergology; Medical University of Gdansk; Gdansk Poland
14. Division and School of Allergy and Clinical Immunology; ASL Salerno and University of Naples Federico II, Naples; Battipaglia Hospital; Salerno Italy
15. Clinical Allergy and Immunology Unit; Foundation IRCCS Ca’ Granda Ospedale Maggiore Policlinico; Milan Italy
16. Allergy and Clinical Immunology Division; Divino Espirito Santo Hospital; Ponta Delgada Portugal
17. Ambulatory for Allergy and Clinical Immunology; Vienna Austria
18. Department of Dermatology; Medical University of Graz; Graz Austria
19. Department of Dermatology and Allergology; Ludwig-Maximilian University; Munich Germany