1. Department of Biosciences, University of Oslo, Oslo, Norway;
2. Department of Genetics, Harvard Medical School, Boston, Massachusetts;
3. Institute for Experimental Medical Research, Oslo University Hospital and University of Oslo, Oslo, Norway;
4. KG Jebsen Cardiac Research Center and Center for Heart Failure Research, University of Oslo, Oslo, Norway;
5. Section for Sport Sciences, Lillehammer University College, Lillehammer, Norway; and
6. Department of Health Sciences, Kristiania University College, Oslo, Norway