Spine
-
Retrospective cohort study at a single institution. ⋯ 4.
-
A retrospective analysis. ⋯ 4.
-
An ambispective analysis. ⋯ 2.
Retrospective cohort study at a single institution. ⋯ 4.
A retrospective analysis. ⋯ 4.
An ambispective analysis. ⋯ 2.