1. Department of Pulmonary and Infectious Diseases, Nordsjaelland Hospital, Hillerød, Denmark;
2. Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark;
3. Department of Respiratory Medicine, Medical Clinic I, Goethe University Hospital, Frankfurt/Main, Germany;
4. CAPNETZ-Stiftung, Hannover Medical School, Hannover, Germany;
5. Department of Medicine, Herlev Gentofte Hospital, Hellerup, Denmark