1. Smart Ageing International Research Center Institute of Development, Aging and Cancer Tohoku University Sendai Japan
2. Division of Developmental Cognitive Neuroscience Institute of Development, Aging and Cancer Tohoku University Sendai Japan
3. Department of Functional Brain Imaging Institute of Development, Aging and Cancer Tohoku University Sendai Japan
4. Department of Community Medical Supports Tohoku Medical Megabank Organization Tohoku University Sendai Japan
5. Department of Radiology and Nuclear Medicine Institute of Development, Aging and Cancer Tohoku University Sendai Japan
6. Hitachi Ltd. Tokyo Japan
7. Central Research Laboratory Hitachi, Ltd. Saitama Japan