University of Padua, Department of Medicine, Padua, Italy. Complutense University of Madrid, Hospital Clinico "San Carlos," Hospital Universitario Madrid Monteprincipe, Madrid, Spain. Hospital Virgen del Rocio, Seville, Spain. University Hospital Pisa, Pisa, Italy. Clinica San Luca, Torino, Italy. Vicenza Regional Hospital, Vicenza, Italy.