Marius Rehn1,2
, Torsten Eken3
, Andreas Jorstad Krüger1,4
, Petter Andreas Steen2,5
, Nils Oddvar Skaga1,6
and Hans Morten Lossius1 
1
Department of Research and Development, Norwegian Air Ambulance Foundation, Drobak, Norway
2
Faculty of Medicine, Faculty Division Ulleval University Hospital, University of Oslo, Norway
3
Department of Anaesthesiology, Aker University Hospital, Oslo, Norway
4
Department of Anaesthesiology and Emergency Medicine, St Olav University Hospital, Trondheim, Norway
5
Prehospital division, Ulleval University Hospital, Oslo, Norway
6
Department of Anaesthesiology, Division of Emergency Medicine, Ulleval University Hospital, Oslo, Norway