1Function of Emergency Medicine, Karolinska University Hospital, Stockholm, Sweden
2Karolinska Institutet, Department of Medicine, Solna, Center for Resuscitation Science, Stockholm, Sweden
3The Prehospital Research Centre, University College of Borås, Borås, Sweden
4School of Health, Care and Social Sciences, Mälardalen University, Västerås, Sweden
5Department of Internal Medicine, Division of Cardiology, Kalmar County Hospital, Kalmar, Sweden
6Kalmar Maritime Academy, Linnaeus University, Kalmar, Sweden
7Department of Medical and Health Sciences, Division of Nursing Science, Linköping University, Linköping, Sweden