1. Department of Psychiatry, Gangnam Center, Seoul National University Hospital, Seoul, Republic of Korea.
2. Department of Medicine, School of Medicine, Seoul National University, Seoul, Republic of Korea.
3. Department of Social Welfare, Induk University, Seoul, Republic of Korea.
4. Department of Social Welfare, Soongsil University, Seoul, Republic of Korea.
5. Department of Psychiatry, School of Medicine, Konkuk University, Seoul, Republic of Korea.