1. Department of Orthopaedic Surgery, Shimoshizu National Hospital, Yotsukaido, Japan
2. Department of Orthopaedic Surgery, Chiba Qiball clinic, Chuo-ku, Japan
3. Department of Orthopaedic Surgery, Graduate School of Medicine, Chiba University, Chuo-ku, Japan
4. Department of Orthopaedic Surgery, Eastern Chiba Medical Center, Togane, Japan
5. Department of Orthopaedic Surgery, St. Marianna University School of Medicine, Miyamae-ku, Kawasaki, Japan