1. Usher Institute University of Edinburgh Edinburgh UK
2. General Practitioners Research Institute (GPRI) Groningen The Netherlands
3. University of Groningen University Medical Center Groningen GRIAC Research Institute Groningen The Netherlands
4. Department of Pediatric Pulmonology and Pediatric Allergology University of Groningen University Medical Center Groningen Beatrix Children's Hospital Groningen The Netherlands
5. University Hospital of Montpellier Montpellier France
6. University Hospital of Nantes Nantes France
7. Observational and Pragmatic Research Institute Singapore Singapore
8. Department of General Practice University of Groningen University Medical Center Groningen Groningen The Netherlands
9. Primary Care and Population Sciences University of Southampton Southampton UK
10. Health Care Centre Näsets Läkargrupp Höllviken Sweden
11. Respiratory Medicine and Allergology Clinical Sciences Lund Lund University Lund Sweden
12. Department of Internal Medicine, Allergology and Clinical Immunology Silesian University of Medicine Katowice Poland
13. IDESP, INSERM – University Montpellier France
14. WHO Collaborating Centre on Scientific Classification Support Montpellier France