1. Department of Kinesiology, Tokyo Metropolitan Institute of Gerontology, Tokyo 173-0015, Japan
2. The Research Institute for the Education of Exceptional Children, Tokyo Gakugei University, Tokyo 184-0015, Japan
3. Department of Physical Therapy, Ibaraki Prefectural University of Health Science, Ibaraki 300-0301, Japan
4. College of Medical Technology and Nursing, University of Tsukuba, Ibaraki 305-0006, Japan
5. Faculty of Health and Sports Sciences, Osaka University, Osaka 560-0006, Japan
6. Department of Physical Therapy, International University of Medicine and Welfare, Tochigi 324-0011, Japan