Affiliation: | 1. Department of Orthopaedic Surgery, Shinonoi General Hospital, 666-1 Ai, Shinonoi, Nagano, 388-8004, Japan 2. Department of Orthopaedic Surgery, Chushin Matsumoto Hospital, Matsumoto Medical Center, Matsumoto, Nagano, Japan 3. Department of Orthopaedic Surgery, Shinshu University School of Medicine, Matsumoto, Nagano, Japan
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