title: What is chronic obstructive pulmonary disease anyway?: Continua, categories, cut points, and moving beyond spirometry.
authors.forename: Stephen I
authors.initials: SI
authors.lastname: Rennard
authors.forename: Jørgen
authors.initials: J
authors.lastname: Vestbo
authors.forename: Alvar
authors.initials: A
authors.lastname: Agustí
mesh_terms: D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis* / Q000503:physiopathology*; D012129:Respiratory Function Tests / Q000379:methods*; D013147:Spirometry