Spine
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Comparative Study
Imaging Comparison Between Chinese and Japanese Patients With Cervical Ossification of the Posterior Longitudinal Ligament.
A retrospective study. ⋯ 3.
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A prospective cohort study. ⋯ 3.
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Prospective case series. ⋯ 2.
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Community-based, cohort study. ⋯ 2.