1. Department of Psychiatry, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
2. Department of Psychiatry, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
3. Division of Biostatistics, Department of R&D Management, Kangbuk Samsung Hospital, Seoul, Republic of Korea
4. Department of Psychiatry, Todak Clinic, Seoul, Republic of Korea