The beginnings of bronchitis.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000397:Air Pollution; D001991:Bronchitis / Q000209:etiology* / Q000401:mortality; D002648:Child; D002675:Child, Preschool; D004427:Ear Diseases / Q000453:epidemiology; D004777:Environment; D005260:Female; D006798:Housing; D006801:Humans; D008297:Male; D008875:Middle Aged; D012140:Respiratory Tract Diseases / Q000453:epidemiology; D012423:Rural Health; D012907:Smoking; D012923:Social Class; D006113:United Kingdom