Spine
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A retrospective case-control study. ⋯ 4.
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Retrospective review of a prospectively collected pediatric orthopedic spine database. ⋯ 4.
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A case-control study was performed on 105 patients with idiopathic scoliosis (IS) and 210 unrelated gender-matched controls from Bulgarian population. ⋯ 4.
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Prospective clinical study. ⋯ 2.
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Cross-sectional study. ⋯ 4.