[1] Lovisenberg Diaconal Univ Coll, Dept Postgrad Studies, Lovisenberg Gt 15b, N-0456 Oslo, Norway
[2] Oslo Univ Hosp, Div Emergencies & Crit Care, Dept Postoperat & Intens Care Nursing, POB 4950 Nydalen, N-0424 Oslo, Norway
[3] Oslo Univ Hosp, Div Emergencies & Crit Care, Dept Res & Dev, POB 4950 Nydalen, N-0424 Oslo, Norway
[4] Univ Oslo, Fac Med, Inst Hlth & Soc, POB 1078 Blindern, NO-0316 Oslo, Norway