1. Allergy Unit; Department of Dermatology; University Hospital Basel; Basel; Switzerland
2. Division Environmental Dermatology and Allergology Helmholtz Zentrum Munich/TUM; Department of Dermatology and Allergology Biederstein; Technical University Munich; Munich; Germany
3. Department of Dermatology; University of Graz; Graz; Austria
4. Regional Adult Cystic Fibrosis Unit; St James's Hospital; Leeds; UK
5. Allergy Department; INSERM U657; Hôpital Arnaud de Villeneuve; University Hospital of Montpellier; Montpellier Cedex 5; France
6. Division of Allergology; Inselspital; University of Bern; Bern; Switzerland
7. Department of Allergy and Clinical Immunology; H. S. João; Medical University; Porto; Portugal