1. Department of Psychiatry, Yong-In Mental Hospital, Yongin, Republic of Korea.
2. Department of Psychiatry, College of Medicine, Hanyang University, Seoul, Republic of Korea.
3. Institute of Mental Health, Hanyang University, Seoul, Republic of Korea.
4. Department of Internal Medicine, College of Medicine, Hanyang University, Seoul, Republic of Korea.
5. Department of Preventive Medicine, College of Medicine, Hanyang University, Seoul, Republic of Korea.