1. Psychiatric Emergency Service Amsterdam (Zoeteman), Inforsa (de Haas), and Department of Research (Peen, Dekker), Arkin Mental Health Care, Amsterdam; Department of Healthy Living, Public Health Service Amsterdam, Amsterdam (de Wit); Department of Psychiatry, Amsterdam University Medical Center, Amsterdam (de Haas); Ambulance Amsterdam, Amsterdam (Borkent); Epidemiological and Social Psychiatric Research Institute, Erasmus Medical Center, and Parnassia Psychiatric Institute, Rotterdam (Mulder).