1. Centre for Clinical Education, University of Copenhagen and the Capital Region of Denmark, Copenhagen, Denmark
2. Department of Surgical Gastroenterology, Copenhagen University Hospital Herlev, Denmark
3. Department of Pulmonology, Gentofte Hospital, University of Copenhagen, Hellerup, Denmark
4. Leiden University Medical Center, Pulmonology Department, Leiden, The Netherlands
5. Pulmonology Department, Academical Medical Center, Amsterdam, The Netherlands