1 Valve Center, Fondazione Poliambulanza Institute, Brescia, Italy; Department of Cardiovascular and Pulmonary Sciences, Catholic University of the Sacred Heart, Rome, Italy.
2 Valve Center, Fondazione Poliambulanza Institute, Brescia, Italy.
3 Valve Center, Fondazione Poliambulanza Institute, Brescia, Italy; Department of Cardiovascular Sciences, Federico II Hospital, Naples, Italy.
4 Valve Center, Fondazione Poliambulanza Institute, Brescia, Italy. Electronic address: andrebuo@hotmail.com.