1. Department of Psychiatry, College of Medicine, Korea University, Seoul, Korea.
2. International Health Care Center, Seoul St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea.
3. Department of Psychiatry, Bucheon St. Mary's Hospital, The Catholic University of Korea College of Medicine, Busan, Korea.
4. Department of Psychiatry, St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea.
5. Department of Psychiatry and Behavioral Medicines, Duke University Medical Center, Durham, NC, USA.