Trends in SAVR with biological vs. mechanical valves in middle-aged patients: results from a French large multi-centric survey oleh Thierry Caus, Thierry Caus, Yuthiline Chabry, Yuthiline Chabry, Joseph Nader, Jean François Fusellier, Jean Louis De Brux, for the EpiCard investigators, Paul Achouh, Christophe Baufreton, Eric Bezon, Olivier Bouchot, Thierry Bourguignon, Lionel Camilleri, Thierry Caus, Nicolas Chavanis, Frédéric Collart, Pierre Corbi, Alain Curtil, Jean Louis De Brux, Roland Demaria, François Bouchard, Jean-Marc Frapier, Jean-Philippe Frieh, Louis Labrousse, Pascal Leprince, Bertrand Marcheix, Jean Philippe Mazzucotelli, Joseph Nader, Jean-Christian Roussel, Vito Giovanni Ruggieri, Michel Tapia, Jean-Philippe Verhoye, Andre Vincentelli