title: Study of alpha 1 antitrypsin levels in chronic obstructive pulmonary disease.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D005260:Female; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000097:blood*; D008297:Male; D008875:Middle Aged; D000515:alpha 1-Antitrypsin / Q000032:analysis*
chemical_list: D000515:alpha 1-Antitrypsin