[1] Sophiahemmet Univ, Dept Hlth Promoting Sci, Box 5605,Lindstedtsvagen 8, S-11486 Stockholm, Sweden
[2] AISAB Ambulance Serv, Johanneshov, Region Of Stock, Sweden
[3] Umea Univ, Dept Nursing, Div Ambulance Serv, S-90187 Umea, Region Of Vaste, Sweden
[4] Swedish Red Cross Univ, Dept Hlth Sci, Box 1059, S-14121 Stockholm, Sweden
[5] Karolinska Inst, Dept Neurobiol Care Sci & Soc, Solna, Sweden
[6] Dalarna Univ, Sch Hlth & Welf, SE-79188 Falun, Sweden