L Spatola1, E Dozio2. 1. Renal and Hemodialysis Unit, Humanitas Clinical and Research Hospital, via Manzoni 56, CAP 20089, Rozzano, MI, Italy. Electronic address: Leonardo.spatola@yahoo.it. 2. Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milan, Italy; Laboratory of Molecular Pathology, IRCCS Policlinico Sand Donato, San Donato Milanese, Milan, Italy.