1. Department of Orthopaedics, Juntendo University Urayasu Hospital, Chiba, Japan
2. Department of Orthopaedics, Juntendo University Faculty of Medicine, Tokyo, Japan
3. Department of Medicine for Orthopedics and Motor Organ, Juntendo University Graduate School of Medicine, Tokyo, Japan
4. Sportology Center, Juntendo University Graduate School of Medicine, Tokyo, Japan