1. Department of Psychiatry, Uijeongbu Eulji Medical Center, Eulji University, Uijeongbu, Korea.
2. Department of Psychiatry, Nowon Eulji Medical Center, Eulji University, Seoul, Korea.
3. Department of Anesthesia and Pain Medicine, Nowon Eulji Medical Center, Eulji University, Seoul, Korea.
4. Department of Anesthesia and Pain Medicine, Yong-In Mental Hospital, Yongin, Korea.
5. Department of Psychiatry, Yong-In Mental Hospital, Yongin, Korea.