title: DAILY VARIATIONS IN SPUTUM VOLUME IN CHRONIC BRONCHITIS.
mesh_terms: D001991:Bronchitis; D029481:Bronchitis, Chronic; D003933:Diagnosis; D004813:Epidemiology; D006801:Humans; D013048:Specimen Handling; D013183:Sputum; D013223:Statistics as Topic
keywords: BRONCHITIS; DIAGNOSIS; EPIDEMIOLOGY; SPECIMEN HANDLING; SPUTUM; STATISTICS