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From the Departments of Psychiatry\/Biobehavioral Sciences and Neurology, University of California\u2013Los Angeles School of Medicine, the West Los Angeles Veterans Affairs Medical Center Psychiatry Service, and Harbor-UCLA Medical Center, Los Angeles, California; the Department of Psychiatry, University of Iowa College of Medicine, Iowa City, Iowa; and the National Institute of Neurological Disorders and Stroke, Bethesda, Maryland...."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeffrey L.","family":"Cummings","sequence":"additional","affiliation":[{"name":"Received June 12, 1997; revised August 13, 1997; accepted August 14, 1997. From the Departments of Psychiatry\/Biobehavioral Sciences and Neurology, University of California\u2013Los Angeles School of Medicine, the West Los Angeles Veterans Affairs Medical Center Psychiatry Service, and Harbor-UCLA Medical Center, Los Angeles, California; the Department of Psychiatry, University of Iowa College of Medicine, Iowa City, Iowa; and the National Institute of Neurological Disorders and Stroke, Bethesda, Maryland...."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lynn A.","family":"Fairbanks","sequence":"additional","affiliation":[{"name":"Received June 12, 1997; revised August 13, 1997; accepted August 14, 1997. From the Departments of Psychiatry\/Biobehavioral Sciences and Neurology, University of California\u2013Los Angeles School of Medicine, the West Los Angeles Veterans Affairs Medical Center Psychiatry Service, and Harbor-UCLA Medical Center, Los Angeles, California; the Department of Psychiatry, University of Iowa College of Medicine, Iowa City, Iowa; and the National Institute of Neurological Disorders and Stroke, Bethesda, Maryland...."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Donna","family":"Masterman","sequence":"additional","affiliation":[{"name":"Received June 12, 1997; revised August 13, 1997; accepted August 14, 1997. From the Departments of Psychiatry\/Biobehavioral Sciences and Neurology, University of California\u2013Los Angeles School of Medicine, the West Los Angeles Veterans Affairs Medical Center Psychiatry Service, and Harbor-UCLA Medical Center, Los Angeles, California; the Department of Psychiatry, University of Iowa College of Medicine, Iowa City, Iowa; and the National Institute of Neurological Disorders and Stroke, Bethesda, Maryland...."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bruce L.","family":"Miller","sequence":"additional","affiliation":[{"name":"Received June 12, 1997; revised August 13, 1997; accepted August 14, 1997. From the Departments of Psychiatry\/Biobehavioral Sciences and Neurology, University of California\u2013Los Angeles School of Medicine, the West Los Angeles Veterans Affairs Medical Center Psychiatry Service, and Harbor-UCLA Medical Center, Los Angeles, California; the Department of Psychiatry, University of Iowa College of Medicine, Iowa City, Iowa; and the National Institute of Neurological Disorders and Stroke, Bethesda, Maryland...."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anne H.","family":"Craig","sequence":"additional","affiliation":[{"name":"Received June 12, 1997; revised August 13, 1997; accepted August 14, 1997. From the Departments of Psychiatry\/Biobehavioral Sciences and Neurology, University of California\u2013Los Angeles School of Medicine, the West Los Angeles Veterans Affairs Medical Center Psychiatry Service, and Harbor-UCLA Medical Center, Los Angeles, California; the Department of Psychiatry, University of Iowa College of Medicine, Iowa City, Iowa; and the National Institute of Neurological Disorders and Stroke, Bethesda, Maryland...."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jane S.","family":"Paulsen","sequence":"additional","affiliation":[{"name":"Received June 12, 1997; revised August 13, 1997; accepted August 14, 1997. From the Departments of Psychiatry\/Biobehavioral Sciences and Neurology, University of California\u2013Los Angeles School of Medicine, the West Los Angeles Veterans Affairs Medical Center Psychiatry Service, and Harbor-UCLA Medical Center, Los Angeles, California; the Department of Psychiatry, University of Iowa College of Medicine, Iowa City, Iowa; and the National Institute of Neurological Disorders and Stroke, Bethesda, Maryland...."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Irene","family":"Litvan","sequence":"additional","affiliation":[{"name":"Received June 12, 1997; revised August 13, 1997; accepted August 14, 1997. 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