Perforation of the Valsalva sinus after implantation of Medtronic Freestyle aortic bioprosthesis - Ozaki, N; Hino, Y; Hanafusa, Y; Yamashita, T; Okada, K; Tsukube, T (Ann Thorac Surg, 2006)
. 10.1016/j.athoracsur.2006.04.074