1. Department of Electrical and Electronic Engineering, Kitami Institute of Technology, Kitami, Japan
2. Department of Physical Medicine & Rehabilitation, Asahikawa Medical University Hospital, Asahikawa, Japan
3. Department of Biosciences and Informatics, Faculty of Science and Technology, Keio University, Kanagawa, Japan
4. Keio Institute of Pure and Applied Sciences (Kipas), Kanagawa, Japan
5. Department of Rehabilitation Medicine, Keio University School of Medicine, Tokyo, Japan
6. Department of Neurosurgery, Asahikawa Medical University, Asahikawa, Japan