1. Department of Orthopaedic Surgery, Toho University Sakura Medical Center, Japan
2. Department of Orthopaedic Surgery, University of Tsukuba, Japan
3. Department of Orthopaedic Surgery, Eastern Chiba Medical Center, Japan
4. Department of Orthopaedic Surgery, Chiba University Graduate School of Medicine, Japan
5. Department of Orthopaedic Surgery, St. Marianna University School of Medicine, Japan