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Minoru Saika, Sinya Kawai, Tetsuo Imagama, Hirotsugu Oda, Tetsurou Murakami, Kouzou Nomura, Hiroshi Tanaka. "Follow-up Study of Cervical Myelopathy due to Ossification of the Posterior Longitudinal Ligament." Orthopedics & Traumatology 34.1 (1985) 326-330