1. Department of Research and Innovation, Clinic for Mental Health and Addiction, Oslo University Hospital, Oslo, Norway
2. Institute of Clinical Medicine, University of Oslo, Oslo, Norway
3. Centre for Educational Measurement, University of Oslo (CEMO), Oslo, Norway
4. Department of Psychiatry, Helse Nord-Trønderlag, Namsos Hospital, Namsos, Norway
5. Department of Mental Health, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
6. Department of Mental Health, Sørlandet Hospital, Arendal, Norway
7. Department of Child and Family Welfare, Faculty of Behavioural and Social Sciences, University of Groningen, Groningen, The Netherlands