1. Center for Clinical Research and Prevention, Bispebjerg and Frederiksberg Hospitals, Frederiksberg, Denmark (Rosenqvist, M.K. Wium-Andersen, I.K. Wium-Andersen, Osler); Psychiatric Center Copenhagen, Dept. O, Frederiksberg Hospital, Frederiksberg, Denmark (I.K. Wium-Andersen, Jørgensen); Section of Epidemiology, Department of Public Health (Osler), and Department of Clinical Medicine (Jørgensen), University of Copenhagen, Copenhagen.