1. Department of Transplant Medicine; Oslo University Hospital, Rikshospitalet; Oslo Norway
2. Institute of Clinical Medicine; University of Tromsø; Tromsø Norway
3. Norwegian Renal Registry; Oslo University Hospital, Rikshospitalet; Oslo Norway
4. Department of Biostatistics; Oslo University Hospital, Ullevål; Oslo Norway
5. Department of Nephrology; Oslo University Hospital, Ullevål; Oslo Norway