title: A two year follow-up study of forced expiratory volumes in a group of cement workers with chronic bronchitis.
mesh_terms: D000328:Adult; D001991:Bronchitis / Q000503:physiopathology*; D002908:Chronic Disease; D003252:Construction Materials / Q000009:adverse effects*; D005541:Forced Expiratory Volume; D006801:Humans; D008297:Male; D008875:Middle Aged; D009784:Occupational Diseases / Q000503:physiopathology*