1 Department of Cardiology, Oslo University Hospital Rikshospitalet, Oslo, Norway; Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway. Electronic address: chris@dodgson.net.
2 Department of Cardiology, Oslo University Hospital Rikshospitalet, Oslo, Norway; Department of Cardiology, Sørlandet Hospital Arendal, Arendal, Norway.
3 Department of Cardiology, Oslo University Hospital Rikshospitalet, Oslo, Norway.