1. Department of Orthopaedics Osaka University Graduate School of Medicine Suita Japan
2. Department of Orthopaedics Osaka International Cancer Institute Osaka Japan
3. Research Center for Charged Particle Therapy National Institute of Radiological Sciences Chiba Japan
4. Department of Orthopaedic Surgery Ashiya Municipal Hospital Ashiya Japan
5. Department of Orthopaedic Surgery Toyonaka Municipal Hospital Toyonaka Japan