title: Unexpected durability of a Björk-Shiley first-generation aortic valve after 40 years of implantation.
authors.affiliation: The Valley-Columbia Heart Center, Ridgewood, New Jersey, USA. brizma@valleyhealth.com
authors.forename: Mariano E
authors.initials: ME
authors.lastname: Brizzio
authors.forename: Alex
authors.initials: A
authors.lastname: Zapolanski
authors.forename: John
authors.initials: J
authors.lastname: Pantazopoulos
authors.forename: Michael
authors.initials: M
authors.lastname: Mentakis