1. School of Health Sciences; University of Tampere; Tampere Finland
2. Institute for Medical Informatics, Biometry and Epidemiology; University of Munich; Munich Germany
3. Allergy & Respiratory Research Group; Center for Population Health Sciences; The University of Edinburgh; Edinburgh UK
4. Department of Pediatrics; Center for Food Allergy Diagnosis and Treatment; Veneto Region; University of Padua; Padua Italy
5. Hannover Medical School; Hanover Germany
6. Hospital Vall d'Hebron; Barcelona Spain
7. Department of Paediatrics; Division of Paediatric Pulmonology and Paediatric Allergy; University Medical Centre Groningen; University of Groningen; RB Groningen the Netherlands
8. Odense University Hospital; Odense C Denmark
9. Department of Pathophysiology and Allergy Research; Medical University of Vienna; Vienna Austria
10. Laboratory of Medical Allergology; Allergy Clinic; Copenhagen University Hospital; Hellerup Denmark
11. David Hide Asthma and Allergy Research Centre; St Mary's Hospital; Newport
12. NIHR Southampton Respiratory Biomedical Research Unit; University of Southampton and University Hospital Southampton NHS Foundation Trust; Southampton UK
13. Human Development and Health Academic Unit; Faculty of Medicine; University of Southampton; Southampton UK
14. Departments of Experimental Immunology and of Otorhinolaryngology; Academic Medical Center; University of Amsterdam; Amsterdam The Netherlands
15. Department of Pediatric Respiratory Medicine and Allergy; Emma Children's Hospital; Academic Medical Center; University of Amsterdam; Amsterdam the Netherlands
16. Division of General Internal Medicine and Primary Care Brigham and Women's Hospital/Harvard Medical School; Boston, MA USA