1. Department of Orthopaedic Surgery, Institute of Medicine, University of Tsukuba, Tsukuba 305-8576, Japan
2. Division of Regenerative Medicine for Musculoskeletal System, Institute of Medicine, University of Tsukuba, Tsukuba 305-8576, Japan
3. Center for Medical Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki 300-0394, Japan
4. Department of Orthopaedic Surgery, Ibaraki Prefectural University of Health Sciences Hospital, Ibaraki 300-0331, Japan
5. Department of Occupational Therapy, School of Health Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki 300-0394, Japan
6. Faculty of Health and Medical Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki 300-0394, Japan
7. Department of Rehabilitation Medicine, Institute of Medicine, University of Tsukuba, Tsukuba 305-8576, Japan