1. Department of Psychiatry, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Korea.
2. Department of Psychiatry, Sanggye Paik Hospital, College of Medicine, Inje University, Seoul, Korea.
3. Department of Psychiatry, Asan Medical Center, Seoul, Korea.
4. Department of Psychiatry, Busan Paik Hospital, College of Medicine, Inje University, Busan, Korea.