1. Cardiac Surgery Unit, Department of Medical-Surgical Cardiology, Hesperia Hospital Modena, 41125 Modena, Italy
2. Cardiac Surgery Unit, Department of Surgical, Medical and Molecular Pathology and Critical Care, Azienda Ospedaliero Universitaria Pisana, University of Pisa, 56126 Pisa, Italy
3. Edwards Lifesciences, 20141 Milano, Italy