Received Jan. 29, 2003; revision received Dec. 5, 2003; accepted June 14, 2004. Presented in part at the 152nd Annual Meeting of the American Psychiatric Association, Washington, D.C., May 15–20, 1999. From the Department of Biochemistry and Molecular Biology, Hanyang University College of Sciences, Ansan, Korea; Seoul National Mental Hospital, Seoul, Korea; the Department of Psychiatry, Korea University College of Medicine, Seoul, Korea; Yong-In Mental Hospital, Yong-In, Korea; and the Department of Neuropsychiatry, Hallym University College of Medicine, Seoul, Korea. Address reprint requests to Dr. Choi, Department of Neuropsychiatry, Hallym University Han-Gang Sacred Heart Hospital, 94-200 Youngdungpo-Dong, Youngdungpo-Gu, Seoul, Korea, 150-719; firstname.lastname@example.org (e-mail). Supported in part by a Jisan Cultural Psychiatry grant from the Psychiatric Research Foundation and grant 01-PJ8-PG6-01NE01-0003 from the Biomedical Brain Research Center, Ministry of Health and Welfare, Republic of Korea.