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Nakase T, Ariga K, Yonenobu K. Activation and localization of cartilage-derived morphogenetic protein-1 at the site of ossification of the ligamentum flavum. Eur Spine J. 2001;10 (4):289-4","DOI":"10.1007\/s005860100307"},{"key":"8","doi-asserted-by":"crossref","unstructured":"8. Liu Y, Zhao Y, Chen Y, et al. RUNX2 polymorphisms associated with OPLL and OLF in the Han population. Clin Orthop Relat Res. 2010;468 (2):3333-41","DOI":"10.1007\/s11999-010-1511-5"},{"key":"9","doi-asserted-by":"crossref","unstructured":"9. Kaneyama S, Doita M, Nishida K, et al. Thoracic myelopathy due to ossification of the yellow ligament in young baseball pitchers. J Spinal Disord Tech. 2008;21 (1):68-71","DOI":"10.1097\/BSD.0b013e31811dfc2d"},{"key":"10","doi-asserted-by":"crossref","unstructured":"10. Yoshiiwa T, Miyazaki M, Kawano M, et al. Analysis of the Relationship between Hypertrophy of the Ligamentum Flavum and Lumbar Segmental Motion with Aging Process. 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Wada K, Terayama K, Ohtsuka K, et al. Ossification of ligaments both in the spine, pelvis and in the extremities a roentgenological study of 200 patients with cervical OPLL. Chubuseisashi. 1986;29 (1):203-5. Japanese"},{"key":"15","doi-asserted-by":"crossref","unstructured":"15. Kawaguchi Y, Nakano M, Yasuda T, et al. Characteristics of ossification of the spinal ligament; incidence of ossification the ligamentum flavum in patients with cervical ossification of the posterior longitudinal ligament - Analysis of the whole spine using multidetector CT. J Orthop Sci. 2016 July;21 (4):439-45","DOI":"10.1016\/j.jos.2016.04.009"},{"key":"16","unstructured":"16. Sato T, Aizawa T. Current status of thoracic myelopathy. Sekitsui Sekizui (Spine & Spinal Cord). 2009;22 (2):136-41. Japanese"},{"key":"17","doi-asserted-by":"crossref","unstructured":"17. Fujimori T, Wabate T, Iwamoto Y, et al. 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