1. Allergy & Respiratory Research Group; Center for Population Health Sciences; The University of Edinburgh; Edinburgh UK
2. School of Public Health; Imperial College; London UK
3. The Evidence Centre Ltd; London UK
4. School of Health Sciences; University of Tampere; Tampere Finland
5. Biometry and Epidemiology; Institute for Medical Informatics; University of Munich; Munich Germany
6. Department of Pediatrics; Center for Food Allergy Diagnosis and Treatment; Veneto Region; University of Padua; Padua Italy
7. David Hide Asthma and Allergy Research Centre; St Mary's Hospital; Newport; Isle of Wight UK
8. NIHR Southampton Respiratory Biomedical Research Unit; University Hospital Southampton NHS Foundation Trust; Southampton UK
9. Faculty of Medicine; Human Development and Health and Clinical Experimental Sciences Academic Units; University of Southampton; Southampton UK
10. Allergy-Center-Charité; Department of Dermatology and Allergy; Charité Universitätsmedizin Berlin; Berlin Germany
11. Allergy Unit; Department Internal Medicine; University Hospital; Ospedali Riuniti; Ancona Italy
12. Allergy Section; Department of Internal Medicine; Hospital Universitari Vall d'Hebron; Barcelona Spain
13. Department of Pediatric Pulmonology and Pediatric Allergy; University of Groningen; University Medical Center Groningen; GRIAC Research Institute; Groningen the Netherlands
14. Department of Paediatrics and Child Health; University College; Cork Ireland
15. University Hospitals of Geneva; Geneva Switzerland
16. Department of Allergy; Hospital Clinico San Carlos; IdISSC; Madrid Spain
17. Hans Christian Andersen Children's Hospital; Odense University Hospital; Odense Denmark
18. MRC & Asthma UK Centre in Allergic Mechanisms of Asthma; London UK
19. Allergy Center Charité; University Hospital Charité; Berlin Germany
20. Department of Pediatric Allergy; Division of Asthma; Allergy & Lung Biology; King's College; London UK
21. Department of Immunoallergology; Coimbra University Hospital; Coimbra Portugal
22. Department of Pediatric Respiratory Medicine and Allergy; Emma Children's Hospital; Academic Medical Center; University of Amsterdam; Amsterdam the Netherlands
23. Division of General Internal Medicine and Primary Care, Brigham and Women's Hospital/Harvard Medical School; Boston MA USA