title: Invited commentary.
authors.affiliation: Department of Surgery, Mayo Clinic, 200 First St SW, Rochester, MN 55905, USA. burkhart.harold@mayo.edu
authors.forename: Harold M
authors.initials: HM
authors.lastname: Burkhart
mesh_terms: D001705:Bioprosthesis; D002114:Calcinosis / Q000209:etiology; D013504:Cardiovascular Surgical Procedures / Q000009:adverse effects*; D002648:Child; D005355:Fibrosis / Q000209:etiology; D006350:Heart Valve Prosthesis / Q000009:adverse effects; D006801:Humans; D012086:Reoperation; D014183:Transplantation, Heterologous / Q000009:adverse effects*; D014184:Transplantation, Homologous / Q000009:adverse effects*; D016896:Treatment Outcome; D014694:Ventricular Outflow Obstruction / Q000209:etiology / Q000601:surgery*