1. Division of Orthopaedic Surgery, Department of Regenerative and Transplant Medicine, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan.
2. Department of Orthopaedic Surgery, Uonuma Kikan Hospital, Niigata, Japan.
3. Department of Orthopaedic Surgery, Niigata Cancer Hospital, Niigata, Japan.
4. Department of Radiology and Radiation Oncology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan.