1. Department of Nephrology and Dialysis, L. Parodi – Delfino Hospital, Colleferro, Rome, Italy
2. Department of Nephrology and Dialysis, S. Anna Hospital, Como, Italy
3. Department of Health Sciences, Renal Division, San Paolo Hospital, University of Milan, Milan, Italy
4. Department of Nephrology and Dialysis, Vito Fazzi Hospital, Lecce, Italy
5. Department of Public Health; Unit of Nephrology, University of Naples Federico II, Naples, Italy
6. International Renal Research Institute, S. Bortolo Hospital, Vicenza, Italy