1. Department of Orthopaedic Surgery, Orthopaedic and Rheumatologic Institute, Cleveland Clinic Foundation, Cleveland, OH, USA
2. Chefarzt Zentrum für Orthopädie und Unfallchirurgie, HELIOS Kliniken Berlin-Buch, Berlin, Germany
3. Department of Medicine for Orthopaedics and Motor Organs, Juntendo University Graduate School of Medicine, Tokyo, Japan
4. Department of Orthopaedics, Faculty of Medicine, Juntendo University, Tokyo, Japan