Kjetil G Ringdal1,2,3
, Hans Morten Lossius1,4
and Kjetil Søreide4,5 
1
Department of Research, Norwegian Air Ambulance Foundation, Drøbak, Norway
2
Division of Emergency Medicine, Oslo University Hospital Ullevål, Oslo, Norway
3
Faculty of Medicine, Faculty Division Ullevål University Hospital, University of Oslo, Oslo, Norway
4
Department of Surgical Sciences, University of Bergen, Bergen, Norway
5
Department of Surgery, Stavanger University Hospital, Stavanger, Norway