1. Tetsuya Shinozaki MD DMSc, Assistant Professor, Department of Orthopedic Surgery, Faculty of Medicine, Gunma University, Gunma, Japan
2. Hideomi Watanabe MD DMSc, Assistant Professor, Department of Orthopedic Surgery, Faculty of Medicine, Gunma University
3. Takashi Yanagawa MD, Postgraduate Student, Department of Orthopedic Surgery, Faculty of Medicine, Gunma University
4. Kenji Shirakura MD DMSc, Associate Professor, Department of Orthopedic Surgery, Faculty of Medicine, Gunma University
5. Kenji Takagishi MD DMSc, Professor, Department of Orthopedic Surgery, Faculty of Medicine, Gunma University