title: Letter: Closing volume and pregnancy.
mesh_terms: D005260:Female; D006801:Humans; D006973:Hypertension / Q000503:physiopathology; D000860:Hypoxia / Q000209:etiology; D010100:Oxygen / Q000097:blood; D011187:Posture; D011247:Pregnancy; D012907:Smoking; D013147:Spirometry; D014797:Vital Capacity
chemical_list: D010100:Oxygen