1. Uni Research, Uni Health, P.O Box 7810, 5020 Bergen, Norway
2. Faculty of Health and Social Sciences, Bergen University College, 5020 Bergen, Norway
3. Research Unit for General Practice, Uni Research, Uni Health, 5020 Bergen, Norway
4. Research Unit for General Practice, Institute of Public Health, Aarhus University, 8000 Aarhus, Denmark
5. Institute of Stress Medicine, Gothenburg 41319, Sweden
6. Department of Public Health and Primary Health Care, University of Bergen, 5020 Bergen, Norway
7. Department of Education and Public Health, University of Bergen, 5020 Bergen, Norway