1. Center for Forensic Mental Health, Chiba University, Chiba-shi, Chiba, Japan
2. Department of Psychiatry, Chiba University Graduate School of Medicine, Chiba-shi, Chiba, Japan
3. Department of Cognitive Behavioural Physiology, Chiba University Graduate School of Medicine, Chiba-shi, Chiba, Japan
4. National Institute of Mental Health, National Center of Neurology and Psychiatry, Kodaira-shi, Tokyo, Japan