1. Department of Rehabilitation, Nerima Hikarigaoka Hospital, Tokyo, Japan
2. Graduate School of Health Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki, Japan
3. Department of Physical Therapy, Ibaraki Prefectural University of Health Sciences, Ibaraki, Japan
4. Center for Medical Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki, Japan