1. Department of Internal Medicine, Division of Nephrology, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
2. Department of Epidemiology, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
3. Department of Medical Microbiology, Division of Clinical Virology, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
4. Department of Transplantation Nephrology and Clinical Immunology Hospices Civils de Lyon, Claude Bernard Lyon I University, INSERM Unit 1111, 69003 Lyon, France