Spine
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An ambispective cohort analysis. ⋯ 3.
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Retrospective case series. ⋯ 4.
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Population-based study. From 2008 to 2017, data from the national database of the Korean Health Insurance Review & Assessment Service were analyzed. The national insurance system and all medical expense bill data of the entire population are included in the database. ⋯ 3.
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Nationwide Readmissions Database Study. ⋯ 3.
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Observational Study
Potential Selection Bias in Observational Studies Comparing Cervical Disc Arthroplasty to Anterior Cervical Discectomy and Fusion.
Retrospective study using a national administrative database. ⋯ 3.