1. Department of Orthopedic Surgery, The University of Tokyo, Tokyo, Japan
2. Department of Orthopedic Surgery, Jichi Medical University, Saitama Medical Center, Saitama, Japan
3. Department of Musculoskeletal Oncology and Rehabilitation, National Cancer Center Hospital, Tokyo, Japan
4. Department of Orthopedic Surgery, Jichi Medical University, Tochigi, Japan