title: Invited commentary.
authors.affiliation: Division of Cardiothoracic Surgery, University of Florida Health Science Center, Jacksonville, FL 32209-6511, USA. fhe@comcast.net
authors.forename: Fred H
authors.initials: FH
authors.lastname: Edwards
mesh_terms: D006348:Cardiac Surgical Procedures / Q000401:mortality*; D006351:Heart Valves / Q000601:surgery*; D017052:Hospital Mortality; D006801:Humans; D008955:Models, Cardiovascular; D018570:Risk Assessment