[1] Univ Gothenburg, Sahlgrenska Acad, Inst Med, Dept Mol & Clin Med, Gothenburg, Sweden
[2] Univ Gothenburg, Sahlgrenska Acad, Inst Med, Hlth Metr Unit, Gothenburg, Sweden
[3] Karolinska Inst, Dept Med, Ctr Resuscitat Sci, Stockholm, Sweden
[4] Univ Gothenburg, Sahlgrenska Acad, Inst Hlth & Care Sci, Gothenburg, Sweden
[5] Ostfold Univ Coll, Halden, Norway
[6] Griffith Univ, Sch Nursing & Midwifery, Nathan, Qld, Australia
[7] Ctr Registers Vastra Gotaland, Gothenburg, Sweden
[8] Univ Boras, Fac Caring Sci Work Life & Social Welf, Prehospen Ctr Prehosp Res, Boras, Sweden