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