1. Department for Methodology and Research Infrastructure Robert Koch‐Institut Berlin Germany
2. Department of Dermatology, Venerology and Allergology Charité ‐ Universitätsmedizin Berlin Berlin Germany
3. Department of Paediatric Pneumology, Immunology and Intensive Care Charité ‐ Universitätsmedizin Berlin Berlin Germany
4. Department of Psychiatry and Psychotherapy Ernst von Bergmann Academic Educational Hospital Berlin Germany
5. Epidemiology Unit German Rheumatism Research Centera Leibniz Institute Berlin Germany
6. Department of Allergy Hospital Universitario La Paz Madrid Spain
7. Department of Immunology Landspitali University Hospital Reykjavik Iceland
8. Faculty of Medicine University of Iceland Reykjavik Iceland
9. Children's Hospital Reykjavik Reykjavik Iceland
10. Department of Allergy Landspitali University Hospital Reykjavik Iceland
11. Division of Infection Immunity & Respiratory Medicine University of Manchester Manchester UK
12. Allergy Department 2nd Paediatric Clinic, National and Kapodistrian University of Athens Athens Greece
13. Department of Pediatric Pulmonology & Pediatric Allergology University Medical Center Groningen Groningen The Netherlands
14. Department of Pediatric Pulmonology & Pediatric Allergology Emma Kinderziekenhuis AMC Amsterdam The Netherlands
15. Clinical and Experimental Sciences and Human Development and Health Faculty of Medicine University of Southampton Southampton UK
16. NIHR Southampton Biomedical Research Centre University Hospital Southampton NHS Foundation Trust Southampton UK
17. Clinical and Experimental Sciences Academic Units Faculty of Medicine University of Southampton Southampton UK
18. Department of Dietetics Salford Care Organisation Salford UK
19. Department of Immunology, Allergy and Rheumatology Medical University Łódź Poland
20. Department of Immunology, Allergy and Rheumatology Medical University of Łódź Łódź Poland
21. Faculty of Medicine Vilnius University Vilnius Lithuania
22. Clinic of Children's Diseases Faculty of Medicine Vilnius University Vilnius Lithuania
23. Department of Allergy Hospital Clínico San CarlosUniversidad Complutense de MadridIdISSC Madrid Spain
24. School of Health Sciences Centre for Health Informatics University of Manchester Manchester UK
25. Departments of Experimental Immunology Academic Medical Center Amsterdam The Netherlands
26. Departments of Experimental Immunology and of Otorhinolaryngology Amsterdam University Medical Centers Amsterdam The Netherlands
27. Division of Infection, Immunity and Respiratory Medicine University of Manchester Manchester UK
28. Institute for Clinical Epidemiology and Biometry University of Würzburg Würzburg Germany
29. State Institute of Health Bavarian Health and Food Safety Authority Bad Kissingen Germany
30. Institute for Social Medicine, Epidemiology and Health Economics Charité ‐ Universitätsmedizin Berlin Berlin Germany