1 Paris Translational Research Centre for Organ Transplantation, University of Paris, Institut National de la Santé et de la Recherche Médicale (INSERM) U970, Paris, France.
2 Renal-Electrolyte and Hypertension Division, Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.
3 Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.
4 Department of Kidney Transplantation, Necker Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France.