1. U.O.C. Nefrologia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Roma, Italia.
2. Università Cattolica del Sacro Cuore, Roma, Italia.
3. Division of Nephrology, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
4. Division of Chemistry, University of Cape Town, Cape Town, South Africa.
5. Renal Unit, Division of Nephrology and Dialysis, Department of Medicine, University of Verona, Verona, Italy.