[Pre-employment low-back x-ray survey; a review of 1500 cases].
D001415:Back; D003625:Data Collection; D004651:Employment; D006801:Humans; D008161:Lumbosacral Region / Q000000981:diagnostic imaging*; D016272:Occupational Health; D011859:Radiography; D013131:Spine / Q000000981:diagnostic imaging*; D014965:X-Rays
BACK; INDUSTRIAL HYGIENE; LUMBOSACRAL REGION/radiography; SPINE/radiography