1. Department of Cardiovascular Respiratory Nephrologic Geriatric and Anesthetic Sciences, Sapienza University of Rome, Rome, Italy
2. Nephrology Unit, Azienda Ospedaliero-Universitaria Policlinico Umberto I, Rome, Italy
3. Department of Experimental Diagnostic and Specialty Medicine (DIMES), Nephrology, Dialysis and Renal Transplant Unit, St Orsola Hospital, University of Bologna, Bologna, Italy
4. Nephrology, Dialysis and Renal Transplant Unit, Vito Fazzi Hospital, Lecce, Italy
5. Ramsay-Générale de Santé, Clinique du Landy, Department of Nephrology and Dialysis and Department of Renal Physiology, Necker Hospital, University of Paris Descartes, Paris, France
6. Fundació Puigvert, Department of Nephrology IIB Sant Pau, RedinRen, Barcelona, Catalonia, Spain