1. Department of Psychiatry, CHA Bundang Medical Center, CHA University, 59 Yatap-ro, Bundang-gu, Seongnam-si 463-712, Gyeonggi-do, Republic of Korea
2. Department of Psychiatry, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, 138 Sheng Li Road, Tainan 70428, Taiwan
3. Department of Psychiatry, Chonbuk National University Medical School, 567 Baekje-daero, Deokjin-gu, Jeonju-si 561-756, Jeollabuk-do, Republic of Korea
4. Research Institute of Clinical Medicine of Chonbuk National University, Biomedical Research Institute of Chonbuk National University Hospital, 20 Geonjiro, Deokjin-gu, Jeonju-si 561-712, Jeollabuk-do, Republic of Korea