[1] Univ Oslo, Hosp Ullevaal, Dept Traumatol, Oslo, Norway
[2] Univ Oslo, Hosp Ullevaal, Dept Anesthesia, PB Nydalen 4950, N-0424 Oslo, Norway
[3] Oslo Univ Hosp, Dept Res & Dev, Div Emergencies & Crit Care, Oslo, Norway
[4] Univ Oslo, Inst Clin Med, Fac Med, Oslo, Norway
[5] Univ Tromso, Arctic Univ Norway, Hammerfest, Norway
[6] Hammerfest Hosp, Dept Anesthesia & Intens Care, Finnmark Hlth trust, Hammerfest, Norway
[7] Oslo Univ Hosp, Div Emergencies & Crit Care, Norwegian Natl Advisory Unit Trauma, Oslo, Norway