1. Department of Epidemiology and Biostatistics, Drexel University School of Public Health, Philadelphia, Pennsylvania
2. Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden3Centre for Epidemiology and Community Medicine, Stockholm County Council, Stockholm, Sweden
3. School of Social and Community Medicine, University of Bristol, Bristol, England5Avon and Wiltshire Partnership National Health Service Mental Health Trust, Bristol, England
4. Department of Epidemiology and Biostatistics, Drexel University School of Public Health, Philadelphia, Pennsylvania6Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden