Center for Clinical Heart Research, Department of Cardiology, Oslo University Hospital Ullevål, P.O. Box 4956 Nydalen, N-0424, Oslo, Norway; Center for Heart Failure Research, Oslo University Hospital, P.O. Box 4956 Nydalen, N-0424, Oslo, Norway; Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, P.O. Box 1171 Blindern, 0318, Oslo, Norway. Electronic address: a.o.awoyemi@medisin.uio.no. Research Institute of Internal Medicine, Oslo University Hospital Rikshospitalet, P.O. Box 4950 Nydalen, N-0424, Oslo, Norway; Section of Clinical Immunology and Infectious Diseases, Oslo University Hospital Rikshospitalet, P.O. Box 4950 Nydalen, N-0424, Oslo, Norway; Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, P.O. Box 1171 Blindern, 0318, Oslo, Norway. Center for Clinical Heart Research, Department of Cardiology, Oslo University Hospital Ullevål, P.O. Box 4956 Nydalen, N-0424, Oslo, Norway; Center for Heart Failure Research, Oslo University Hospital, P.O. Box 4956 Nydalen, N-0424, Oslo, Norway; Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, P.O. Box 1171 Blindern, 0318, Oslo, Norway. Center for Clinical Heart Research, Department of Cardiology, Oslo University Hospital Ullevål, P.O. Box 4956 Nydalen, N-0424, Oslo, Norway; Center for Heart Failure Research, Oslo University Hospital, P.O. Box 4956 Nydalen, N-0424, Oslo, Norway.