1. Center for Clinical Research and Prevention Bispebjerg and Frederiksberg Hospital Frederiksberg Denmark
2. Department of Epidemiology, Biostatistics, and Biodemography Institute of Public Health University of Southern Denmark Odense Denmark
3. The Danish Twin Registry University of Southern Denmark Odense Denmark
4. Psychiatric Center Copenhagen Rigshospital Denmark
5. Institute of Clinical Medicine University of Copenhagen Kobenhavns Denmark
6. Department of Public Health Section of Epidemiology University of Copenhagen Kobenhavns Denmark