1. Department of Respiratory Medicine; Odense University Hospital; Odense Denmark
2. Institute of Clinical Research; University of Southern Denmark; Odense Denmark
3. The Copenhagen City Heart Study; Frederiksberg Hospital; Copenhagen Denmark
4. The Copenhagen General Population Study; University of Copenhagen; Copenhagen Denmark
5. Respiratory and Allergy Research Group; Manchester Academic Health Science Centre; University Hospital South Manchester NHS Foundation Trust; Manchester UK
6. Department of Clinical Biochemistry; Herlev Hospital; Copenhagen University Hospital; University of Copenhagen; Copenhagen Denmark
7. Department of Clinical Pharmacology; University of Southern Denmark; Odense Denmark
8. Respiratory Section; Hvidovre Hospital; Copenhagen University Hospital; University of Copenhagen; Copenhagen Denmark
9. Department of Social Medicine; Institute of Public Health; University of Copenhagen; Copenhagen Denmark