[1] Rigshosp, Copenhagen, Denmark
[2] Univ Copenhagen, DK-1168 Copenhagen, Denmark
[3] Ashburton Hosp, Canterbury Dhb, New Zealand
[4] Univ Turku, SF-20500 Turku, Finland
[5] Helsinki Univ Hosp, Dept Emergency Med & Serv, Helsinki, Finland
[6] Univ Helsinki, FIN-00014 Helsinki, Finland
[7] Karolinska Inst, Dept Clin Sci & Educ, Stockholm, Sweden
[8] Soder Sjukhuset, Dept Emergency Med, Stockholm, Sweden