1. Department of Pulmonary Medicine, Copenhagen University Hospital, Hvidovre, Denmark
2. Department of Internal Medicine, Respiratory Medicine Section, Herlev-Gentofte Hospital, Hellerup, Denmark
3. Department of Pulmonary Medicine, Bispebjerg Hospital, Copenhagen, Denmark
4. Department of Respiratory Diseases, Aalborg University Hospital and the Clinical Institute, Aalborg University, Aalborg, Denmark
5. Department of Medicine, Vejle Hospital, Vejle, Denmark