1 Unit of Nephrology, Azienda Socio-Sanitaria Territoriale Papa Giovanni XXIII, Bergamo, Italy; Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Bergamo, Italy. Electronic address: camillo.carrara@gmail.com.
2 Unit of Nephrology, Azienda Socio-Sanitaria Territoriale Papa Giovanni XXIII, Bergamo, Italy.