1. Department of Clinical and Molecular Medicine, NTNU, Norwegian University of Science and Technology, Trondheim, Norway;
2. Department of Oncology, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway;
3. Department of Thoracic Medicine, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway;
4. Department of Oncology, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway;
5. Department of Thoracic Medicine, Haukeland University Hospital, Bergen, Norway;
6. Department of Pulmonology, University Hospital of North Norway, Tromsø, Norway;
7. Department of Oncology, Oslo University Hospital, Oslo, Norway;
8. Department of Pulmonary Medicine, Stavanger University Hospital, Stavanger, Norway;
9. Department of Pulmonary Medicine, Haugesund Hospital, Haugesund, Norway