1. Seoul Health Foundation, Seoul, Korea
2. Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Korea
3. Department of Psychiatry, Naju National Hospital, Naju, Korea
4. Department of Psychiatry, Jeju National University Hospital, Jeju, Korea
5. Department of Psychiatry, Chung-Ang University, Seoul, Korea
6. Department of Psychiatry, Iksan Hospital, Iksan, Korea