1. Department of Medical Sciences, Occupational and Environmental Medicine, Uppsala University, Uppsala, Sweden
2. Department of Health and Sport, School of Health and Welfare, Halmstad University, Halmstad, Sweden
3. Department of Occupational and Environmental Medicine, Uppsala University Hospital, Uppsala, Sweden
4. Department of Medical Sciences, Psychiatry, Uppsala University, Uppsala, Sweden
5. Central Hospital in Karlstad, Karlstad, Sweden