1. Department of Cardiology, Istituto Policlinico San Donato, E. Malan Cardiovascular Center, University of Milan, Milan, Italy
2. Department of Critical Care Medicine, University of Florence, Florence, Italy
3. Department of Cardiology, University Hospital, Bucharest, Romania
4. Department of Cardiac Surgery, Istituto Policlinico San Donato, E. Malan Cardiovascular Center, University of Milan, Milan, Italy.