1 Division of Nephrology, Hypertension and Kidney Transplantation, Department of Medicine, Harold Simmons Center for Kidney Disease Research and Epidemiology, University of California Irvine School of Medicine, Orange, CA, USA.
2 Nephrology Section, Department of Medicine, Veterans Affairs Long Beach Healthcare System, Long Beach, CA, USA.
3 Section of Nephrology, Department of Internal Medicine, Multi-Organ Transplant Center, William Beaumont Hospital, Oakland University William Beaumont School of Medicine, Royal Oak, MI, USA.
4 Dipartimento di Medicina e Chirurgia, University Hospital of Parma, Parma, Italy.
5 Nephrologie, Centre Hospitalier Le Mans, Avenue Roubillard 186, 72000, Le Mans, France. gbpiccoli@yahoo.it.