1. Department of Psychiatry, Korea University College of Medicine, Seoul, Korea
2. Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Korea
3. Department of Psychiatry, Dongguk University Gyeongju Hospital, Gyeongju, Korea
4. Department of Psychiatry, Sungkyunkwan University School of Medicine, Kangbuk Samsung Hospital, Seoul, Korea
5. Department of Psychiatry, Kyung Hee University School of Medicine, Seoul, Korea
6. Department of Psychiatry, Gyeongsang National University School of Medicine and Gyeongsang National University Hospital, Jinju, Korea
7. Department of Psychiatry and Behavioural Sciences, Duke University Medical Center, Durham, NC, USA