1. Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa 920-8641, Japan
2. Department of Orthopaedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya 467-8601, Japan
3. Department of Orthopaedic Surgery, Kanazawa Medical University, Kahoku 920-0293, Japan