[1] Stavanger Univ Hosp, Reg Ctr Emergency Med Res & Dev RAKOS, Stavanger, Norway
[2] Stavanger Univ Hosp, Dept Anesthesiol & Intens Care Med, Stavanger, Norway
[3] Univ Bergen, Clin Inst 1, Fac Med, Way, MS USA
[4] Innlandet Hosp, Emergency Med Commun Ctr, Gjovik, Norway
[5] Sta vanger Univ Hosp, Emergency Med Commun Ctr, Stavanger, Norway
[6] Stavanger Univ Hosp, POB 8100, NO-4068 Stavanger, Norway