1 Department of General and Specialized Surgery "Paride Stefanini,", Sapienza University of Rome, Rome, Italy.
2 Liverpool Centre for Cardiovascular Science, University of Liverpool and Liverpool Heart & Chest Hospital, United Kingdom.
3 Department of Clinical Internal, Anesthesiological, and Cardiovascular Sciences, Sapienza University of Rome, Rome, Italy. Electronic address: daniele.pastori@uniroma1.it.