Spine
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Comparative Study
Cervical Disc Protrusion Correlates with the Severity of Cervical Disc Degeneration: A Cross-Sectional Study of 1,211 Relatively Healthy Volunteers.
Cross-sectional study. ⋯ 2.
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Matched case-control study. ⋯ 3.
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A retrospective study with retrospective and prospective inclusion of 100 patients. ⋯ 3.
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Retrospective case series. ⋯ 3.
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This is a cross-sectional descriptive study. ⋯ 2.