1. Department of Cardiology, Division of Medicine, Akershus University Hospital, Lørenskog, Norway
2. Center for Heart Failure Research, University of Oslo, Norway
3. Department of Medical Biochemistry, Oslo University Hospital, Rikshospitalet, and Institute for Clinical Medicine, University of Oslo, Norway
4. Norwegian National Unit for newborn screening, Woman and Children‘s division, Oslo University Hospital, Rikshospitalet, Norway
5. Department of Cardiology, Oslo University Hospital, Rikshospitalet, Norway