1. University of Padua, Department of Medicine; Padua Italy
2. Complutense University of Madrid, Hospital Clinico “San Carlos,” Hospital Universitario Madrid Monteprincipe; Madrid Spain
3. Hospital Virgen del Rocio; Seville Spain
4. University Hospital Pisa; Pisa Italy
5. Clinica San Luca; Torino Italy
6. Vicenza Regional Hospital; Vicenza Italy