1. Division of Orthopedic Surgery, Department of Regenerative and Transplant Medicine, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan
2. Department of Orthopedic Surgery, Uonuma Kikan Hospital, Niigata 949-7302, Japan
3. Division of Comprehensive Musculoskeletal Medicine, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan
4. Department of Orthopedic Surgery, Tachikawa General Hospital, Niigata 940-8621, Japan