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Influence of K-line on intraoperative and hidden blood loss in patients with ossification of the posterior longitudinal ligament when undergoing unilateral open-door laminoplasty. J Orthop Surg Res. 2021;16 (1):34.","DOI":"10.1186\/s13018-020-02181-9"},{"key":"27","doi-asserted-by":"crossref","unstructured":"27. Okada E, Yagi M, Fujita N, et al. Lumbar spinal canal stenosis in patients with diffuse idiopathic skeletal hyperostosis: surgical outcomes after posterior decompression surgery without spinal instrumentation. J Orthop Sci. 2019;24 (6):999-1004.","DOI":"10.1016\/j.jos.2019.08.010"},{"key":"28","doi-asserted-by":"crossref","unstructured":"28. Wen L, Jin D, Xie W, et al. Hidden Blood Loss in Anterior Cervical Fusion Surgery: An Analysis of Risk Factors. World Neurosurg. 2018;109:e625-9.","DOI":"10.1016\/j.wneu.2017.10.050"},{"key":"29","doi-asserted-by":"crossref","unstructured":"29. Yin H, He X, Luo Z, et al. 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