title: Maintaining registers that provide reliable and valid information is not easy.
authors.forename: Richard
authors.initials: R
authors.lastname: Smith
authors.forename: Robert
authors.initials: R
authors.lastname: Johnston
mesh_terms: D013504:Cardiovascular Surgical Procedures / Q000401:mortality*; D017052:Hospital Mortality; D006801:Humans; D017063:Outcome Assessment, Health Care; D011643:Publishing