Spine
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Retrospective database analysis. ⋯ 3.
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Prospective descriptive study. ⋯ 2.
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An Internet-based evaluation of Web sites using a validated assessment tool. ⋯ N/A.
Retrospective database analysis. ⋯ 3.
Prospective descriptive study. ⋯ 2.
An Internet-based evaluation of Web sites using a validated assessment tool. ⋯ N/A.