Affiliation: | 1. Department of Orthopaedic Surgery, Yamagata University School of Medicine, 2‐2‐2 Iida‐nishi, Yamagata, Yamagata 990‐9585;2. Department of Hard Tissue Engineering, Tokyo Medical and Dental University, 1‐5‐45 Yushima, Bunkyo‐ku, Tokyo 113‐8549, Japan |