title: Defining operative mortality: it should be easy, but is it?
authors.forename: William
authors.initials: W
authors.lastname: Williams
mesh_terms: D006348:Cardiac Surgical Procedures / Q000401:mortality*; D006330:Heart Defects, Congenital / Q000401:mortality* / Q000601:surgery; D017052:Hospital Mortality; D006801:Humans; D017063:Outcome Assessment, Health Care / Q000145:classification*; D012042:Registries; D018570:Risk Assessment