title: Why things go clunk in your back.
authors.affiliation: Emergency Medical Training Associates, Olympia, WA, USA.
authors.forename: M
authors.initials: M
authors.lastname: Smith
mesh_terms: D019567:Back Injuries / Q000209:etiology / Q000517:prevention & control*; D004634:Emergency Medical Technicians; D006801:Humans; D016272:Occupational Health; D014481:United States / Q000453:epidemiology