MEASUREMENT OF SPUTUM VOLUME IN FACTORY AND OFFICE WORKERS.
D001699:Biometry; D001991:Bronchitis; D004813:Epidemiology; D006801:Humans; D009787:Occupational Medicine; D013048:Specimen Handling; D013183:Sputum; D013223:Statistics as Topic
BRONCHITIS; EPIDEMIOLOGY; INDUSTRIAL MEDICINE; SPECIMEN HANDLING; SPUTUM; STATISTICS