title: Letter: Preemployment back X-rays.
mesh_terms: D001415:Back / Q000000981:diagnostic imaging*; D006801:Humans; D008161:Lumbosacral Region / Q000000981:diagnostic imaging; D009786:Occupational Health Services; D009787:Occupational Medicine; D011859:Radiography; D013131:Spine / Q000000981:diagnostic imaging