1. Department of Orthopedic Surgery, Tokyo Rosai Hospital, Tokyo, Japan.
2. Department of Orthopaedic Surgery, Faculty of Medicine, Juntendo University, Tokyo, Japan.
3. Department of Orthopaedic Surgery, Tokyo Medical University, Tokyo, Japan.
4. Department of Orthopaedic Surgery, Funabashi Orthopaedic Hospital, Funabashi, Japan.