1. Center for Clinical Research and Prevention Bispebjerg and Frederiksberg Hospital Frederiksberg Denmark
2. Psychiatric Center Copenhagen Rigshospitalet Copenhagen Denmark
3. Institute of Clinical Medicine University of Copenhagen Copenhagen Denmark
4. The Danish Aging Research Center and The Danish Twin Registry, Department of Public Health University of Southern Denmark Odense Denmark
5. Department of Psychology University of Minnesota Minneapolis MN USA
6. Department of Public Health, Section of Epidemiology University of Copenhagen Copenhagen Denmark