1. Department of Clinical Service, Division of Cancer Medicine, Oslo University Hospital, Oslo, Norway
2. Department of Psychiatry, University of Pittsburgh School of Medicine and Medical Center, Pittsburgh, PA, USA
3. Department of Respiratory Medicine, Division of Cardiovascular and Pulmonary Diseases, Oslo University Hospital, Oslo, Norway
4. Faculty of Medicine, Institute of Clinical Medicine, University of Oslo, Norway
5. Department of Physiotherapy, Oslo Metropolitan University, Oslo, Norway
6. Unit for C-L Psychiatry and Psychosomatic Medicine, Division of Mental health and Dependency, Oslo University Hospital, Oslo, Norway
7. Department of Respiratory Diseases and Allergy, Akershus University Hospital, Nordbyhagen, Norway
8. Department of Research and Education, Division of Clinical Neuroscience, Oslo University Hospital, Oslo, Norway