1. Institute of Behavioral Science in Medicine; Yonsei University College of Medicine; Seoul Korea
2. Department of Psychiatry; National Health Insurance Service Ilsan Hospital; Goyang Korea
3. Department of Psychiatry; Seoul St. Mary's Hospital; The Catholic University of Korea College of Medicine; Seoul Korea
4. Department of Nuclear Medicine; Yonsei University College of Medicine; Seoul Korea
5. Department of Psychiatry; Yonsei University College of Medicine; Seoul Korea