EXPERIMENTAL CLINIC FOR PREVENTING CHRONIC BRONCHITIS.
D000397:Air Pollution; D000554:Ambulatory Care Facilities; D001699:Biometry; D001991:Bronchitis; D029481:Bronchitis, Chronic; D006801:Humans; D011315:Preventive Medicine; D012907:Smoking; D013223:Statistics as Topic
AIR POLLUTION; BRONCHITIS; PREVENTIVE MEDICINE; SMOKING; STATISTICS