Use of the medtronic freestyle for aortic valve infection: a retrospective propensity score matched analysis - Easo, Jerry; Szczechowicz, Marcin; Hölzl, Philipp; Horst, Michael; Eichstaedt, Harald Christian; Zhigalov, Konstantin; Mashhour, Ahmed; Weymann, Alexander; Dapunt, Otto E. (Journal of cardiac surgery, 2019)