[1] Stavanger Univ Hosp, Dept Anaesthesiol & Intens Care, Stavanger, Norway
[2] Stavanger Univ Hosp, Stavanger Acute Med Fdn Educ & Res, Stavanger, Norway
[3] Univ Bergen, Dept Clin Med, Bergen, Norway
[4] Norwegian Air Ambulance Fdn, Dept Res & Dev, Drobak, Norway
[5] Univ Stavanger, Dept Hlth Care Sci, Stavanger, Norway
[6] Haukeland Hosp, Dept Anaesthesiol & Intens Care, N-5021 Bergen, Norway