title: Reply: To PMID 21724737.
authors: Y C
authors: YC
authors: Tzeng
mesh_terms: D002245:Carbon Dioxide / Q000378:metabolism*; D006801:Humans; D010100:Oxygen / Q000378:metabolism*; D011659:Pulmonary Gas Exchange / Q000502:physiology*; D015656:Respiratory Mechanics / Q000502:physiology*
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen