Spine
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An experimental study. ⋯ 5.
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Cross-sectional study. ⋯ 3.
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A case-control study. ⋯ 4.
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A cross-sectional database study. ⋯ 3.
An experimental study. ⋯ 5.
Cross-sectional study. ⋯ 3.
A case-control study. ⋯ 4.
A cross-sectional database study. ⋯ 3.