1 Departments of Cardiac Surgery and Radiology, S. Orsola-Malpighi Hospital, University of Bologna, Via Massarenti No 9, 40128 Bologna, Italy.
2 Departments of Cardiac Surgery and Radiology, S. Orsola-Malpighi Hospital, University of Bologna, Via Massarenti No 9, 40128 Bologna, Italy. Electronic address: davide.pacini@unibo.it.