1. Research Centre for Prevention and Health, Rigshospitalet Glostrup Hospital, Glostrup, Denmark
2. Hans Christian Andersen Children’s Hospital, Odense University Hospital, Odense, Denmark
3. Respiratory Research Unit, Department of Respiratory Medicine, Bispebjerg Frederiksberg University Hospital, Copenhagen, Denmark
4. Department of Occupational and Environmental Medicine, Bispebjerg – Frederiksberg Hospital, Copenhagen, Denmark
5. Research Unit of General Practice, Institute of Public Health, University of Southern Denmark, Odense, Denmark
6. Department of Respiratory Medicine, Naestved Hospital, Region Zealand, Denmark
7. Department of Respiratory Medicine, Zealand University Hospital Roskilde, Region Zealand, Denmark
8. Institute of Regional Health Research, University of Southern Denmark, Odense, Denmark
9. The Danish Clinical Registries, Aarhus, Denmark