title: Site versus level.
authors.forename: Paul C
authors.initials: PC
authors.lastname: McCormick
mesh_terms: D001863:Bone Screws; D005260:Female; D006801:Humans; D008297:Male; D011859:Radiography; D013122:Spinal Diseases / Q000000981:diagnostic imaging* / Q000601:surgery*; D013904:Thoracic Vertebrae / Q000000981:diagnostic imaging* / Q000601:surgery*