1. Division of Orthopedic Surgery, Department of Regenerative and Transplant Medicine, Niigata University Graduate School of Medical and Dental Sciences , Niigata, Japan
2. Division of Orthopedic Surgery, Sanjo Sogo Hospital , Sanjo, Niigata, Japan
3. Rehabilitation Center, Niigata University Medical and Dental General Hospital , Niigata, Japan
4. Department of Rheumatology, Niigata Rheumatic Center , Shibata, Niigata, Japan