title: Invited commentary.
authors.affiliation: Division of Cardiothoracic Surgery, University of Pennsylvania Medical Center, The Farm Journal Building, 230 W Washington Square, 3rd Floor, Philadelphia, PA 19106, USA. cbridges@pahosp.com
authors.forename: Charles R
authors.initials: CR
authors.lastname: Bridges
mesh_terms: D006350:Heart Valve Prosthesis / Q000706:statistics & numerical data*; D006801:Humans; D008944:Mitral Valve Insufficiency / Q000175:diagnosis / Q000208:ethnology* / Q000601:surgery; D008946:Mitral Valve Stenosis / Q000175:diagnosis / Q000208:ethnology* / Q000601:surgery