Spine
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A cross-sectional study. ⋯ 2.
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Retrospective study of a national database. ⋯ 3.
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A retrospective, long-term follow-up study. ⋯ 4.
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Retrospective radiographical clinical study. ⋯ 3.
A cross-sectional study. ⋯ 2.
Retrospective study of a national database. ⋯ 3.
A retrospective, long-term follow-up study. ⋯ 4.
Retrospective radiographical clinical study. ⋯ 3.