1. National Institute for Health Research Biomedical Research Centre, University of Bristol, Bristol, United Kingdom
2. Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden
3. Centre for Academic Mental Health, Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, United Kingdom
4. Avon and Wiltshire Partnership National Health Service Mental Health Trust, Bristol, United Kingdom
5. Centre for Epidemiology and Community Medicine, Stockholm Health Care Services, Stockholm, Sweden