1 The Intervention Centre, Oslo University Hospital, Rikshospitalet, Oslo, Norway. Electronic address: kwendt@ous-hf.no.
2 Department of Informatics, Oslo University Hospital, Rikshospitalet, Oslo, Norway.
3 Department of Cardiothoracic and Vascular Surgery, Oslo University Hospital, Rikshospitalet, Oslo, Norway; Institute of Clinical Medicine, Medical Faculty, University of Oslo, Oslo, Norway.
4 Oslo Centre for Biostatistics and Epidemiology (OCBE), Oslo University Hospital, Rikshospitalet, Oslo, Norway.
5 The Intervention Centre, Oslo University Hospital, Rikshospitalet, Oslo, Norway; Institute of Clinical Medicine, Medical Faculty, University of Oslo, Oslo, Norway.