Spine
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Cross-sectional study. ⋯ 3.
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Prospective genetic association study. ⋯ 4.
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Validation of a self-report questionnaire. ⋯ 3.
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Retrospective review. ⋯ 4.
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A case-control study of the Trp2/3 alleles of COL9A2/3 genes and their correlation with occurrence of Lumbar disc disease (DDD) as phenotyped by magnetic resonance imaging. ⋯ N/A.