1. Papa Giovanni XXIII Hospital, Bergamo, Italy
2. University of Pavia, Istituto Di Ricovero e Cura a Carattere Scientifico, Policlinico San Matteo, Pavia, Italy
3. Medical University of Vienna, Vienna, Austria
4. San Bortolo Hospital, Vicenza, Italy
5. University of Padua, Padua, Italy
6. University of Florence, Florence, Italy
7. Mayo Clinic, Rochester, MN
8. Ospedale di Circolo e Fondazione Macchi, Varese, Italy