1. Departments of Cardiology (K.N., K.R., A.K.A., M.Y., E.G., E.B., A.R.A., I.G., L.G.), Oslo University Hospital Rikshospitalet, Norway.
2. Institute of Clinical Medicine, Faculty of Medicine (K.N., K.R., A.K.A., M.Y., L.G.), University of Oslo, Norway.
3. KG Jebsen Center for Cardiac Research (K.N., K.R., E.G., L.G.), University of Oslo, Norway.
4. Center for Heart Failure Research, Oslo University Hospital, Norway (K.N., K.R., E.G., L.G.).
5. Norwegian Health Association, Oslo, Norway (K.R., M.Y.).
6. Transplantation Medicine (D.O.D.), Oslo University Hospital Rikshospitalet, Norway.
7. Transplant Institute, Sahlgrenska University Hospital, Gothenburg, Sweden (J.P.W., K.K.).
8. Department of Cardiology, Bispebjerg University Hospital, Copenhagen, Denmark (C.H.D.).
9. University of Copenhagen, Denmark (C.H.D., F.G.).
10. Rigshospitalet, Copenhagen, Denmark (F.G.).