1 Division of Cardiology, University of Torino, Department of Medical Sciences, "Città della Salute e della Scienza" Hospital, C.so A.M. Dogliotti 14, 10126 Torino, Italy. Electronic address: carla.giustetto@unito.it.
2 Division of Cardiology, San Lazzaro Hospital, Via P. Belli 26, 12051 Alba, CN, Italy.
3 Clinica Pinna Pintor, Via Amerigo Vespucci, 61, 10129 Torino, Italy.