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Yoshiaki Toyama Department of Orthopaedic Surgery Keio University, School of Medicine Shinjuku, Tokyo, Japan ► Atsushi Miyawaki RIKEN, Center for Brain Science Laboratory for Cell Function Dynamics Wako, Saitama, Japan ► Masaya Nakamura Department of Orthopaedic Surgery Keio University, School of Medicine Shinjuku, Tokyo, Japan ► Masahiro Jinzaki Department of Diagnostic Radiology Keio University, School of Medicine Shinjuku, Tokyo, Japan