title: Invited commentary.
authors.affiliation: National Heart and Lung Institute, Imperial College, Department of Cardiothoracic Surgery, Hammersmith Hospital, Imperial College Healthcare NHS Trust, 150 Du Cane Rd, London, UK W13 8AJ. p.punjabi@imperial.ac.uk
authors.forename: Prakash P
authors.initials: PP
authors.lastname: Punjabi
mesh_terms: D001705:Bioprosthesis / Q000191:economics*; D006349:Heart Valve Diseases / Q000601:surgery*; D006350:Heart Valve Prosthesis / Q000191:economics*; D019918:Heart Valve Prosthesis Implantation / Q000191:economics* / Q000379:methods*; D006801:Humans; D008943:Mitral Valve / Q000601:surgery*; D018803:Models, Economic