title: The effect of film quality and other factors on the roentgenographic categorization of coal workers' pneumoconiosis.
mesh_terms: D003032:Coal Mining; D004813:Epidemiology; D006801:Humans; D009784:Occupational Diseases / Q000000981:diagnostic imaging*; D011009:Pneumoconiosis / Q000000981:diagnostic imaging* / Q000453:epidemiology; D013902:Radiography, Thoracic / Q000592:standards*; D012129:Respiratory Function Tests; D014481:United States