[INVESTIGATIONS ON CHRONIC BRONCHITIS AS A DISEASE OF THE MASSES].
D001991:Bronchitis; D029481:Bronchitis, Chronic; D004813:Epidemiology; D006801:Humans; D006814:Hungary; D012907:Smoking
BRONCHITIS; EPIDEMIOLOGY; HUNGARY; SMOKING
AZ IDUELT HOERGHURUT N'EPBETEGS'EG JELLEG'ERE VONATKOZ'O VIZSG'ALATOK.