Spine
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Retrospective case series. ⋯ 4.
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Retrospective review of prospectively collected data. ⋯ 3.
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National registry cohort study. ⋯ 3.
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Case report on resection of a hemivertebra at the craniocervical junction. ⋯ 4.
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Case report and literature review. ⋯ 5.