1. a Division of Psychiatry , Helse Fonna HF , Haugesund, Norway
2. b Section of Psychiatry , University of Bergen , Bergen, Norway
3. c Research Centre for Health Promotion , University of Bergen , Bergen, Norway
4. d Norwegian Institute of Public Health, Division of Mental Health , Oslo, Norway
5. e Institute of Psychology, University of Oslo , Oslo, Norway
6. f Division of Psychiatry , Helse Bergen HF , Bergen, Norway