1. Department of Transplant Medicine Oslo University Hospital, RikshospitaletOslo Norway
2. Department of Nephrology Oslo University Hospital, UllevålOslo Norway
3. Department of Pathology Oslo University Hospital, Rikshospitalet Oslo Norway
4. Metabolic and Renal Research Group UiT The Arctic University of Norway Tromsø Norway
5. Department of Immunology and Transfusion Medicine Oslo University Hospital, UllevålOslo Norway
6. Department of Biostatistics University of OsloOslo Norway
7. Norwegian Renal Registry Oslo University Hospital, Rikshospitalet Oslo Norway