From the Parnassia Psychiatric Institute, The Hague; the Department of Psychiatry and Neuropsychology, Maastricht University Medical Center, Maastricht, the Netherlands; the Department of Epidemiology, Mailman School of Public Health, Columbia University and New York State Psychiatric Institute, New York; the Department of Psychiatry, University Medical Center Groningen, Groningen, the Netherlands; and Stichting Rivierduinen, Leiden, the Netherlands.