Chronic bronchitis:  an introductory examination of existing data.
D001991:Bronchitis / Q000706:statistics & numerical data*; D029481:Bronchitis, Chronic; D006801:Humans
BRONCHITIS/statistics
Lancet. 1951 Sep 8;2(6680):440-6
14874401
Br Med J. 1949 Feb 19;1(4598):306-8
18109340