1 Mechanical Circulatory Support Program, Cardiac Surgery Unit, San Gerardo Hospital, Monza, Italy; Department of Medicine and Surgery, University of Milano-Bicocca, Monza, Italy; Cardiac Surgery Unit, Cardio-thoracic-vascular Department, San Gerardo Hospital, Monza, Italy. Electronic address: francesco_formica@fastwebnet.it.
2 Cardiac Surgery Unit, Cardio-thoracic-vascular Department, San Gerardo Hospital, Monza, Italy.