Spine
-
Retrospective study. ⋯ 4.
-
Retrospective review. ⋯ 2.
-
Cross-sectional. ⋯ 2.
-
Retrospective cohort study. ⋯ 3.
-
A study of mechanically induced herniation in punctured ovine discs followed by structural analysis. ⋯ N /A.