The onset of chronic bronchitis in childhood.
D000293:Adolescent; D001249:Asthma / Q000209:etiology; D001991:Bronchitis / Q000453:epidemiology / Q000209:etiology*; D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D003371:Cough / Q000209:etiology; D004787:Environmental Pollution; D005260:Female; D006801:Humans; D008297:Male; D010947:Plants, Toxic; D012907:Smoking / Q000150:complications; D012931:Social Environment; D013223:Statistics as Topic; D014026:Nicotiana / Q000009:adverse effects