Furuya T, Ijima Y, Saito J, Kitamura M, Orita S, Ohtori S, Inage K, Funayama T, Miura K. De novo Ossification of the Posterior Longitudinal Ligament related to Pseudarthrosis after Anterior Cervical Decompression and Fusion with floating of the Ossification Foci. J Spinal Surg 2017; 4 (3):130-132.