title: "This" is topped again.
authors.forename: J B
authors.initials: JB
authors.lastname: Flege
mesh_terms: D001024:Aortic Valve Stenosis / Q000601:surgery*; D001705:Bioprosthesis; D001026:Coronary Artery Bypass; D005500:Follow-Up Studies; D019918:Heart Valve Prosthesis Implantation; D006801:Humans; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D014680:Veins / Q000637:transplantation*