1. Department of Psychiatry, The Jikei University School of Medicine, Tokyo, Japan
2. Department of Neuropsychiatry, Keio University School of Medicine, Tokyo, Japan
3. Multimodal Imaging Group, Research Imaging Centre, Centre for Addiction and Mental Health, Toronto, Canada
4. Geriatric Mental Health Division, Centre for Addiction and Mental Health, Toronto, Canada
5. Department of Psychiatry, University of Toronto, Toronto, Canada
6. Institute of Medical Science, University of Toronto, Toronto, Canada
7. Department of Anatomy, Tokyo Medical University, Tokyo, Japan