Affiliation: | 1. Dept. of Orthopaedic Surgery, Tokyo Medical and Dental Univ., Bunkyo‐ku, Tokyo, Japan;2. Dept. of Orthopaedic Surgery, Yanbian Univ. Hospital, Yanji City, Jilin Province, China;3. Graduate School of Dentistry, Tohoku Univ., Aoba‐ku, Sendai, Japan |