Affiliation: | 1. Department of Orthopaedic Surgery, Okayama University Hospital, 2-5-1 Shikata-cho, Kitaku, Okayama, Okayama, 700-8558, Japan 2. Department of Anesthesiology and Resuscitology, Okayama University Hospital, 2-5-1 Shikata-cho, Kitaku, Okayama, Okayama, 700-8558, Japan
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