title: Drawing conclusions from Pollock et al.: limitations imposed study design.
authors.forename: K
authors.initials: K
authors.lastname: Drasner
mesh_terms: D000775:Anesthesia, Spinal / Q000009:adverse effects*; D000818:Animals; D001416:Back Pain / Q000209:etiology*; D006801:Humans; D012107:Research Design