Affiliation: | 1. Department of Orthopaedic Surgery, Tohoku Orthopaedic Clinic, 4-9-22 Kamiyagari, Izumi-ku, Sendai, 981-3121, Japan 2. Department of Orthopaedic Surgery, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, 980-8574, Japan
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