The annual chest roentgenogram for the control of tuberculosis in hospital employees: recent changes and their implications.
D006291:Health Policy; D006801:Humans; D009922:Oregon; D010564:Personnel, Hospital; D013902:Radiography, Thoracic / Q000191:economics; D014374:Tuberculin Test; D014397:Tuberculosis, Pulmonary / Q000517:prevention & control*