title: Long-term oxygen therapy.
authors.forename: T L
authors.initials: TL
authors.lastname: Petty
mesh_terms: D017079:Exercise Tolerance / Q000502:physiology; D006801:Humans; D010102:Oxygen Inhalation Therapy; D029424:Pulmonary Disease, Chronic Obstructive / Q000628:therapy*; D016138:Walking / Q000502:physiology