Cytology of the respiratory tract in advanced age.
D000368:Aged; D000375:Aging; D001980:Bronchi / Q000166:cytology; D004847:Epithelial Cells; D005260:Female; D006801:Humans; D008297:Male; D008679:Metaplasia / Q000209:etiology; D008875:Middle Aged; D011230:Precancerous Conditions; D012137:Respiratory System / Q000166:cytology*; D012142:Respiratory Tract Neoplasms / Q000473:pathology; D012907:Smoking; D013183:Sputum / Q000166:cytology