Spine
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Retrospective cohort study. ⋯ 3.
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This is a cross-sectional study. ⋯ 3.
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Large cohort study of volunteers aged over 50. ⋯ 3.
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Comparative Study
Interest of Laparoscopy for "En bloc" Resection of Primary Malignant Sacral Tumors by Combined Approach. Comparative study with Open Median Laparotomy.
Retrospective case-control study. ⋯ 4.
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Observational Study
Vitamin D Levels and One-Year Fusion Outcomes in Elective Spine Surgery: A Prospective Observational Study.
Prospective observational study. ⋯ 3.