title: Polycythaemia in a selected group of patients with chronic airways obstruction.
mesh_terms: D000368:Aged; D000402:Airway Obstruction / Q000097:blood / Q000150:complications*; D001991:Bronchitis / Q000097:blood / Q000150:complications; D002908:Chronic Disease; D005260:Female; D006400:Hematocrit; D006801:Humans; D000860:Hypoxia / Q000150:complications; D008297:Male; D008875:Middle Aged; D010100:Oxygen / Q000097:blood; D011086:Polycythemia / Q000209:etiology*
chemical_list: D010100:Oxygen