1. Department of Information and Communication Engineering, Tokyo Institute of Technology, Japan
2. Department of Computer Science, Tokyo Institute of Technology, Japan
3. Department of Rehabilitation Medicine, Akita University Hospital, Japan
4. Department of Neurology, National Hospital Organization Akita National Hospital, Japan
5. Department of Neurology, Akita City Hospital, Japan
6. Department of Orthopedic Surgery, Akita University Graduate School of Medicine, Japan