1. Department of General Practice, Institute of Health and Society, University of Oslo, Oslo, Norway
2. Department of Pharmacoepidemiology, Norwegian Institute of Public Health, Oslo, Norway
3. Department of Dermatology, Institute of Clinical Medicine, Oslo University Hospital, University of Oslo, Oslo, Norway
4. Division of Mental and Physical Health, Norwegian Institute of Public Health, Oslo, Norway
5. Department of Community Medicine and Global Health, Institute of Health and Society, University of Oslo, Oslo, Norway
6. Oslo Centre for Biostatistics and Epidemiology, Oslo University Hospital and University of Oslo, Oslo, Norway