1Department of Orthopaedic Surgery, School of Medicine, International University of Health and Welfare, Tokyo, Japan
Address for correspondence Toshiyasu Nakamura, MD, PhD, Department of Orthopaedic Surgery, School of Medicine, International University of Health and Welfare, 8-10-16 Akasaka, Minato-ku, Tokyo 107-0052, Japan (e-mail: [email protected]).
Conflict of Interest None declared.