1. The Research Unit PROgrez, Department of Physiotherapy and Occupational Therapy, Naestved-Slagelse-Ringsted Hospitals, Slagelse, Denmark;
2. Department of Respiratory Medicine, Naestved-Slagelse-Ringsted Hospitals, Naestved, Denmark;
3. Institute of Regional Health Research and
4. Research Unit for Musculoskeletal Function and Physiotherapy, University of Southern Denmark, Odense, Denmark;
5. Department of Respiratory Medicine, Hvidovre Hospital, Hvidovre, Denmark;
6. Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark;
7. Department of Respiratory Medicine, Odense University Hospital, Odense, Denmark;
8. Allergy and Lung Clinic, Elsinore, Denmark;
9. Department of Respiratory Medicine, Aalborg University Hospital, Aalborg, Denmark;
10. Department of Respiratory Medicine, Bispebjerg Hospital, Copenhagen, Denmark;
11. Department of Physiotherapy and Occupational Therapy, and Pulmonary Disease Unit, Diagnostic Center, Silkeborg Regional Hospital, Silkeborg, Denmark;
12. Department of Primary Care, Population Sciences and Medical Education, University of Southampton, Southampton, United Kingdom; and
13. Department of Respiratory Medicine, Zealand University Hospital, Roskilde, Denmark