KU Leuven - Department of Microbiology, Immunology and Transplantation, Imperial College London - Department of Immunology and Inflammation, Harvard University - Massachusetts General Hospital, Cedars-Sinai Medical Center - Department of Pathology and Laboratory Medicine, Université Paris Cité - Department of Nephrology and Transplantation, University of Nebraska Medical Center - Division of Nephrology, University of Alberta - Department of Laboratory Medicine and Pathology, Assistance Publique-Hôpitaux de Paris - Department of Kidney Transplantation, Medical University of Vienna - Division of Nephrology and Dialysis, KU Leuven - Department of Microbiology, Immunology and Transplantation, Erasmus University Rotterdam (EUR) - Department of Clinical Bioinformatics, Mayo Clinic - Department of Laboratory Medicine and Pathology, University of Pittsburgh - Department of Hepatic and Transplantation Pathology, - School of Medicine, University of Göttingen - Department of Nephrology and Rheumatology, Vanderbilt University - Department of Pathology, Microbiology and Immunology, University of Manitoba - Department of Pathology, University of Alberta - Department of Medicine, University of Wisconsin-Madison - Department of Surgery, Guy's and St Thomas' NHS Foundation Trust, Cedars-Sinai Medical Center - Division of Nephrology, Medical University of Vienna - Department of Urology, Medical University of Vienna - Department of Pathology, Westmead Hospital - Department of Renal Medicine, Necker-Enfants Malades Hospital - Department of Pathology, University of Pittsburgh - Thomas E. Starzl Transplant Institute, Harvard University - Massachusetts General Hospital, McGill University - Division of Nephrology & Multi-Organ Transplant Program, Mayo Clinic - Division of Nephrology and Hypertension, University of Alberta - Department of Laboratory Medicine and Pathology, Northwestern University, Hospices Civils de Lyon - Department of Transplantation Nephrology and Clinical Immunology, University of Manitoba - Department of Immunology, Université de Paris Cité - INSERM, Assistance Publique-Hôpitaux de Paris - Department of Kidney Transplantation and University of Alberta - Department of Laboratory Medicine and Pathology