title: Aortic ball-valve prosthesis after 38 years.
authors.forename: Robert S
authors.initials: RS
authors.lastname: Litwak
mesh_terms: D001021:Aortic Valve / Q000601:surgery*; D005500:Follow-Up Studies; D006350:Heart Valve Prosthesis; D006801:Humans; D011474:Prosthesis Design; D012828:Silicones
chemical_list: D012828:Silicones