title: [Immunological study of chronic obstructive pulmonary diseases].
mesh_terms: D000328:Adult; D000368:Aged; D002908:Chronic Disease; D006801:Humans; D007136:Immunoglobulins / Q000032:analysis; D008173:Lung Diseases, Obstructive / Q000276:immunology*; D008297:Male; D008875:Middle Aged
chemical_list: D007136:Immunoglobulins