Percutaneous and surgical aortic valve replacement. Impact of volume and type of center on results oleh Iván J. Núñez-Gil, Javier Elola, María García-Márquez, José L. Bernal, Cristina Fernández-Pérez, Andrés Íñiguez, Luis Nombela-Franco, Pilar Jiménez-Quevedo, Javier Escaned, Carlos Macaya, Antonio F ernández-Ortiz