[1] Univ Hosp San Giovanni Dio & Ruggi dAragona, Div Nephrol Dialysis & Transplantat, Salerno, Italy
[2] Univ Pisa, Dept Clin & Expt Med, Pisa, Italy
[3] Hosp Pescia, Nephrol Unit, Pescia, Italy
[4] Univ Alexandria, Epidemiol Dept, High Inst Publ Hlth, Alexandria, Egypt
[5] Univ Naples 2, Nephrol Div, Naples, Italy
[6] CNR IFC IBIM, Clin Epidemiol & Physiopathol Renal Dis & Hyperte, Reggio Di Calabria, Italy