1. Department of Orthopedic Surgery, Seirei Sakura Citizen Hospital
2. Department of Orthopedic Surgery, Tsukuba Medical Center Hospital
3. Department of Orthopedic Surgery, Chiba University, Graduate School of Medicine
4. Department of Orthopedic Surgery, St. Marianna University School of Medicine
5. Department of Orthopedic Surgery, Faculty of Medicine, University of Tsukuba