1. Norwegian Competence Center for Sleep Disorders, Haukeland University Hospital, Bergen, Norway
2. Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
3. Department of Psychosocial Science, University of Bergen, Bergen, Norway
4. Optentia Research Focus Area, North-West University, Vanderbijlpark, South Africa
5. Department of Health Promotion, Norwegian Institute of Public Health, Oslo, Norway
6. Department of Mental Health, Norwegian University of Science and Technology, Trondheim, Norway
7. Department of Research and Development, St. Olavs University Hospital, Trondheim, Norway
8. Voss District Psychiatric Hospital, NKS Bjørkeli AS, Voss, Norway
9. Department of Health and Caring Sciences, Western Norway University of Applied Sciences, Bergen, Norway