[1] Linkoping Univ, Fac Hlth Sci, Dept Biomed & Clin Sci, Linkoping, Sweden
[2] Local Hlth Care Serv Cent Ostergotland, Dept Emergency Med, SE-58185 Linkoping, Sweden
[3] Lund Univ, Skane Univ Hosp, Dept Emergency Med, Lund, Sweden
[4] Orebro Univ, Orebro Univ Hosp, Dept Emergency Med, Orebro, Sweden
[5] Linkoping Univ, Fac Hlth Sci, Dept Biomed & Clin Sci, Div Drug Res, Linkoping, Sweden