1. Department of Prosthetics and Orthotics, Faculty of Health Sciences, Hokkaido University of Science: 7-15-4-1 Maeda, Teine, Sapporo, Hokkaido 006-8585, Japan
2. Department of Physical Therapy, Faculty of Health Sciences, Hokkaido University of Science, Japan
3. Department of Information Engineering, Faculty of Engineering, Hokkaido University of Science, Japan