Comparison of Two Contemporary Balloon-Expandable Transcatheter Heart Valves: Sapien 3 versus Sapien 3 Ultra - Bhadra, O. D.; Demal, T. J.; Schneeberger, Y.; Ludwig, S.; Waldschmidt, L.; Grundmann, D.; Voigtlaender, L.; Linder, M.; Schofer, N.; Blankenberg, S.; Reichenspurner, H.; Seiffert, M.; Conradi, L.; Westermann, D.; Schaefer, A. (The Thoracic and Cardiovascular Surgeon, 2021)