1. Division of Orthopedic Surgery, Department of Sensory of Motor Organs, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan
2. Department of Orthopedic Surgery, Eastern Shimane Medical and Welfare Center, Matsue 690-0864, Japan
3. Department of Cardiovascular Surgery, Hakuai Hospital, Yonago 683-0853, Japan
4. Department of Orthopedic Surgery, Sanin-Rosai Hospital, Yonago 683-8605, Japan