1. Department of Precision Engineering, The University of Tokyo, Bunkyo-ku, Japan
2. Center for Medical Sciences, Ibaraki Prefectural University of Health Sciences, Inashiki-gun, Japan
3. Research into Artifacts, Center for Engineering (RACE), The University of Tokyo, Tokyo, Japan
4. Ibaraki Prefectural University of Health Sciences Hospital, Inashiki-gun, Japan
5. Division on Neuroscience, Department of Physiology, Asahikawa Medical University, Hokkaido, Japan