1. Department of Regenerative and Transplant Medicine, Division of Orthopaedic Surgery, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
2. Department of Orthopaedic Surgery, Uonuma Institute of Community Medicine, Niigata University Medical and Dental Hospital, Minami-Uonuma, Niigata, Japan
3. Department of Orthopaedic Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
4. Department of Orthopaedic Surgery, Faculty of Medicine, Yamagata University, Yamagata, Japan
5. Department of Orthopaedic Surgery, Faculty of Medicine, Tohoku Medical and Pharmaceutical University, Sendai, Japan