1. Department of Artificial Joints and Biomaterials, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
2. Department of Orthopaedic Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
3. Department of Orthopaedic Surgery, Kure Medical Center and Chugoku Cancer Center, Hiroshima, Japan
4. Department of Orthopaedic Surgery, Hiroshima Prefectural Rehabilitation Center, Hiroshima, Japan