Picco JM, Wolff S, Astesiano A, Wolff D, Astesiano A. Quadricuspid aortic valve. The four-leaf clover of echocardiography. Rev Ecocardiogr Pract Otras Tec Imag Card (RETIC) [Internet]. 2018 Aug. 31 [cited 2026 Nov. 7];1(2):39-42. Available from: https://imagenretic.org/RevEcocarPract/article/view/191