title: Invited commentary.
authors.affiliation: Department of Cardiovascular Surgery, University Hospital Hamburg, Martinistr 52, 20249Hamburg, Germany. Electronic address: helmutgulbins@aol.com.
authors.forename: Helmut
authors.initials: H
authors.lastname: Gulbins
mesh_terms: D001705:Bioprosthesis; D005260:Female; D006350:Heart Valve Prosthesis; D006351:Heart Valves / Q000601:surgery*; D006801:Humans; D008297:Male; D010496:Pericardium / Q000637:transplantation*; D011475:Prosthesis Failure