1 Department of Anesthesiology, Division of Emergencies and Critical Care, Oslo University Hospital, Kirkeveien 166, 0368, Oslo, Norway. lars.oivind.hoiseth@hotmail.com.
2 Division of Cardiovascular and Pulmonary Diseases, Oslo University Hospital, Oslo, Norway. lars.oivind.hoiseth@hotmail.com.
3 Norwegian Air Ambulance Foundation, Drøbak, Norway.
4 Division of Prehospital Care, Oslo University Hospital, Oslo, Norway.