title: Authors' reply to Brusasco and colleagues and Quanjer and colleagues.
authors.affiliation: Department of Primary Care and Public Health, Imperial College London, London W6 8RP, UK francesca.conway07@imperial.ac.uk.
authors.forename: Francesca
authors.initials: F
authors.lastname: Conway
authors.affiliation: Department of Primary Care and Public Health, Imperial College London, London W6 8RP, UK.
authors.forename: Azeem
authors.initials: A
authors.lastname: Majeed
authors.affiliation: Department of Primary Care and Public Health, Imperial College London, London W6 8RP, UK.
authors.forename: Graham
authors.initials: G
authors.lastname: Easton
mesh_terms: D019468:Disease Management; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive; D011788:Quality of Life; D012129:Respiratory Function Tests / Q000379:methods*