1. Department of Psychiatry, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Korea.
2. Center for Clinical Research, Samsung Biomedical Research Institute, Seoul, Korea.
3. St. Andrew's Hospital, Icheon, Korea.
4. Yong-In Mental Hospital, Yongin, Korea.
5. Department of Psychiatry, Seoul National University College of Medicine, Seoul, Korea.