Spine
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This is a cross-sectional study. ⋯ 3.
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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.
This is a cross-sectional study. ⋯ 3.
Prospective observational study. ⋯ 3.