1. Department of Interdisciplinary Health Sciences, Institute of Health and Society, Faculty of Medicine, University of Oslo, Oslo, Norway
2. Surgical Department, Lovisenberg Diaconal Hospital, Oslo, Norway
3. Department of Physical Performance, Norwegian School of Sport Sciences, Oslo, Norway
4. Department of Pulmonary Medicine, Oslo University Hospital, Oslo, Norway
5. Department of Family Health Care Nursing, University of California, San Francisco, CA, USA
6. Research Department, Lovisenberg Diaconal Hospital, Oslo, Norway
7. Department of Medical Research, Bærum Hospital, Gjettum, Norway
8. Medical Department, Lovisenberg Diaconal Hospital, Oslo, Norway