1 K.G. Jebsen Center for Cardiac Biomarkers, Institute of Clinical Medicine, University of Oslo, PO Box 1171-Blindern, Oslo 0318, Norway.
2 Department of Cardiology, Akershus University Hospital, Sykehusveien 25, 1478 Lørenskog, Norway.
3 Department of Cardiology, Oslo University Hospital, Sognsvannsveien 20, 0372, Oslo, Norway.
4 Department of Anaestesiology, Akershus University Hospital, Lørenskog, Norway.
5 Unit of Cardiology, Department of Medicine, Karolinska Institutet, and Heart and Vascular and Neuro Theme, Karolinska University Hospital, Stockholm, Sweden.