1. Department of Medical Sciences and Public Health; University of Cagliari; Cagliari Italy
2. Department of Pediatric Allergy and Asthma; School of Medicine; Gazi University; Ankara Turkey
3. Department of Respiratory Medicine; Academic Medical Centre; University of Amsterdam; Amsterdam The Netherlands
4. Department of Paediatrics; Imperial College London; London UK
5. Department of General Practice and Department of Clinical Pharmacy & Pharmacology; University Medical Centre Groningen; University of Groningen; Groningen The Netherlands
6. Department of Respiratory Medicine and Allergology; Lund University; Lund Sweden
7. Klinik für Kinder and Jugendmedizin Kinderzentrum; Bethel Evangelisches Krankenhaus; Allergy Center; Ruhr University Bochum; Bielefeld Germany
8. Respiratory Medicine and Allergology - Department of Experimental and Clinical Medicine; University of Catania; Catania Italy
9. School of Medicine; Hacettepe University; Ankara Turkey
10. National Heart & Lung Institute; Imperial College London; London UK
11. Institute of Technology; University of Tartu; Tartu Estonia
12. Department of Microbiology and Immunology; Laboratory of Clinical Immunology; KU Leuven Belgium
13. Centre Lead for Respiratory Medicine and Allergy; University Hospital of South Manchester; Education and Research Centre; University of Manchester; Manchester UK