title: Chronic obstructive pulmonary disease outcomes: can we now compare apples with apples?
authors.forename: G I
authors.initials: GI
authors.lastname: Snell
mesh_terms: D006801:Humans; D016040:Lung Transplantation / Q000379:methods; D029424:Pulmonary Disease, Chronic Obstructive / Q000601:surgery*; D012720:Severity of Illness Index