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The pathogenesis of ossification of the posterior longitudinal ligaments (OPLL) has not been clarified. We here report dizygotic twin sisters with OPLL of the cervical spine and propose a new pathogenesis of OPLL. This is the first report of dizygotic twins with OPLL. The twins suffered from schizophrenia, which might be related to the pathogenesis of OPLL. In addition, we investigated the occurrence...
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