1. Catholic University, Rome - Italy
2. Renal Unit, Salvatore Maugeri Foundation, Pavia - Italy
3. Nephrology and Dialysis Unit, A.O. of the Province of Lodi - Italy
4. Nephrology and Dialysis Unit, S. Giovanni Bosco Hospital, Turin - Italy
5. Nephrology and Dialysis Unit, Ospedali Riuniti, Foggia - Italy
6. Nephrology and Dialysis Unit, S. Eugenio Hospital, Rome - Italy
7. Nephrology and Dialysis Unit, San Carlo Borromeo Hospital - Milan, Italy
8. Nephrology and Dialysis Unit, S. Anna Hospital, Como - Italy
9. Nephrology and Dialysis Unit, S. Camillo Forlanini Hospital, Rome - Italy
10. Department of Nephrology, Ospedale Generale, Imperia - Italy
11. Nephrology and Dialysis Unit, AUSL 12 Viareggio, Ospedale Versilia, Lido di Camaiore - Italy
12. Vascular Surgery Department, Ospedali Riuniti, Ancona - Italy