Marzia Cottini1, Amedeo Pergolini1, Piero Gentile2, Francesco Musumeci1. 1. Department of Heart and Vessels, Cardiac Surgery Unit and Heart Transplantation Center, "S. Camillo-Forlanini" Hospital, Rome, Italy. 2. Cardiovascular Department, Ospedali Riuniti Trieste, Trieste, Italy.