1. Division of Medicine, Akershus University Hospital, Lørenskog, Norway;
2. Norway and Center for Heart Failure Research, University of Oslo, Oslo, Norway;
3. Multidiciplinary Laboratory Medicine and Medical Biochemistry, Akershus University Hospital, Lørenskog, Norway;
4. Institute for Experimental Medical Research, Oslo University Hospital, Ullevål, Oslo, Norway;
5. Center for Heart Failure Research, University of Oslo, Oslo, Norway