1. Division of Nephrology, Department of Advanced Medical and Surgical Sciences, University of Campania, Naples, Italy
2. Division of Nephrology, Dialysis, and Transplantation, Policlinico San Martino, Genoa, Italy
3. Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
4. Nephrology and Dialysis Unit, Santa Maria della Pietà Hospital, Nola, Italy
5. Nephrology and Dialysis Unit, Santa Maria della Scaletta Hospital, Imola, Italy
6. Nephrology and dialysis Unit, Mauriziano Hospital, Turin, Italy
7. U.O.S. Terapia Conservativa della Malattia Renale Cronica, U.O.C. Nefrologia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Roma, Italy
8. Università Cattolica del Sacro Cuore, Roma, Italy