1. Department of Rehabilitation, Hitachino Orthopedic Clinic, Ushiku, Japan.
2. Department of Physical Therapy, Ibaraki Prefectural University of Health Sciences, Ami, Japan.
3. Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ami, Japan.
4. Center for Medical Sciences, Ibaraki Prefectural University of Health Sciences, Ami, Japan.
5. Department of Orthopaedic Surgery, Ibaraki Prefectural University of Health Sciences, Ami, Japan.