1. Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba 305-8575, Japan
2. Department of Rehabilitation Medicine, Ibaraki Prefectural University of Health Sciences Hospital, Ami 300-0331, Japan
3. Center for Medical Science, Ibaraki Prefectural University of Health Sciences, Ami 300-0394, Japan
4. Department of Orthopaedic Surgery, Ibaraki Prefectural University of Health Sciences Hospital, Ami 300-0331, Japan
5. Department of Rehabilitation Medicine, Institute of Medicine, University of Tsukuba, Tsukuba 305-8575, Japan
6. Department of Physical Therapy, Ibaraki Prefectural University of Health Sciences Hospital, Ami 300-0331, Japan