title: Invited Commentary.
authors.affiliation: Division of Cardiac Surgery, University of Maryland School of Medicine, 110 S Paca St, Baltimore, MD 21201. Electronic address: jsgammiemd@gmail.com.
authors.forename: James S
authors.initials: JS
authors.lastname: Gammie
mesh_terms: D005260:Female; D019918:Heart Valve Prosthesis Implantation; D006801:Humans; D008297:Male; D008944:Mitral Valve Insufficiency / Q000601:surgery*; D057832:Watchful Waiting