1. University of Oslo, Oslo, Norway.
2. Oslo University Hospital, Oslo, Norway.
3. Akershus University Hospital, Lørenskog, Akershus, Norway.
4. Stavanger University Hospital, Helse
Stavanger HF, Stavanger, Norway.
5. Campus Ahus, 6
HØKH, Research Centre, Akershus
University Hospital, Norway and University
of Oslo Faculty of Medicine, Institute of Clinical
Medicine, Campus AHUS, Oslo, Norway.