Spine
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Online survey. ⋯ 3.
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Retrospective cohort study. ⋯ 3.
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Retrospective study. ⋯ 4.
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Retrospective cohort study, Level of Evidence III. ⋯ 3.
Online survey. ⋯ 3.
Retrospective cohort study. ⋯ 3.
Retrospective study. ⋯ 4.
Retrospective cohort study, Level of Evidence III. ⋯ 3.