1. The Catholic University of Korea College of Medicine, Bucheon St. Mary's Hospital, Department of Psychiatry, 2 Sosa-Dong, Wonmi-Gu, Bucheon, Kyeonggi-Do 420-717, Republic of Korea ; ;
2. Duke University Medical Center, Department of Psychiatry and Behavioral Sciences, Durham, NC, USA
3. Korea University, College of Medicine, Ansan Hospital, Department of Psychiatry, Ansan, Kyounggi-Do, Republic of Korea
4. Global Medical Education, New York, NY, USA