1 Department of Nephrology and Transplantation, Strasbourg University Hospital, Strasbourg, France.
2 Department of Transplantation, Nephrology and Clinical Immunology, Hospices Civils de Lyon, Edouard Herriot Hospital, Lyon, France.
3 Department of Virology, Strasbourg University Hospital, Strasbourg, France.
4 Department of Nephrology and Transplantation, Strasbourg University Hospital, Strasbourg, France. Electronic address: Sophie.caillard@chru-strasbourg.fr.