title: Author's reply to Datta.
authors.affiliation: King's Fund, London, UK j.appleby@kingsfund.org.uk.
authors.forename: John
authors.initials: J
authors.lastname: Appleby
mesh_terms: D000556:Ambulatory Surgical Procedures / Q000639:trends*; D006801:Humans; D013222:State Medicine / Q000639:trends*