1 Department of Nephrology-Dialysis-Transplantation, University of Liège, Centre Hospitalier Universitaire Sart Tilman, Liège, Belgium; Department of Nephrology-Dialysis-Apheresis, Hôpital Universitaire Carémeau, Nîmes, France. Electronic address: pierre_delanaye@yahoo.fr.
2 Department of Public Health and Primary Care, Katholieke Universiteit Leuven Campus Kulak Kortrijk, Kortrijk, Belgium.
3 Department of Medicine, Geffen School of Medicine, University of California, Los Angeles, California, USA.