1. Department of Infection and Immunity; Luxembourg Institute of Health; Esch-sur-Alzette Luxembourg
2. National Unit of Immunology and Allergology; Centre Hospitalier de Luxembourg; Luxembourg Luxembourg
3. Clinic of Immuno-Allergology; CHU Brugmann; Université Libre de Bruxelles; Brussels Belgium
4. Pediatric Pneumology Unit; Hôpital Femme-Mère-Enfant; Bron France
5. Allergology Unit; Immunology Laboratory; Centre Hospitalier Lyon-Sud; Lyon France
6. Allergy Unit; Department of Dermatology; Faculty of Medicine; Eberhard Karls University; Tübingen Germany
7. Institute of Environmental Medicine; Karolinska Institutet; Stockholm Sweden
8. Sachs' Children and Youth Hospital; Södersjukhuset; Stockholm Sweden
9. St John's Institute of Dermatology; King's College London; London UK
10. Immunology and Allergy Unit; Department of Medicine; Karolinska Institutet; Karolinska University Hospital; Stockholm Sweden
11. Department of Respiratory Medicine; INSERM UMRS 903; University Hospital; Reims France
12. Groupe Hospitalier Cochin; Service de Pathologie Professionnelle; Université Paris Descartes; Paris France
13. Department of Pediatrics; Hôpital Delafontaine; Saint Denis France
14. Department of Dermatology and Allergy Center; Odense Research Center for Anaphylaxis; University of Southern Denmark; Odense Denmark