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*; D006331:Heart Diseases / Q000401:mortality / Q000601:surgery*; D006801:Humans; D008962:Models, Theoretical; D015203:Reproducibility of Results; D018570:Risk Assessment; D012720:Severity of Illness Index