title: A 'four-leaf clover' aortic valve.
authors: Department of Cardiothoracic and Vascular Surgery, Università Vita-Salute San Raffaele, Milan, Italy.
authors: A
authors: A
authors: Grimaldi
authors: E
authors: E
authors: Collu
authors: A
authors: A
authors: Castiglioni
authors: G
authors: G
authors: La Canna
authors: M
authors: M
authors: De Bonis
authors: E
authors: E
authors: Bignami
authors: G
authors: G
authors: Melisurgo
authors: O
authors: O
authors: Alfieri