1. Papa Giovanni XXIII Hospital; Bergamo Italy
2. University of Cologne; Cologne Germany
3. Medical University of Vienna; Vienna Austria
4. University of Pavia; I.R.C.C.S. Policlinico San Matteo Pavia Italy
5. University of Padua; Padua Italy
6. University of Florence; Florence Italy
7. Medical University of Vienna; Austria
8. S. Bortolo Hospital; Vicenza Italy
9. Mayo Clinic; Rochester Minnesota