1 University of Ljubljana, Faculty of Health Sciences, Ljubljana, Slovenia.
2 118 Emilia Est Emergency Medical Communication Center, Maggiore Hospital, Bologna, Italy.
3 University of Maribor, Faculty of Health Sciences, Maribor, Slovenia.
4 Department of Anaesthesia and Intensive Care, Oslo University Hospital and Division of Medicine, Institute of Clinical Medicine, University of Oslo, Oslo, Norway.
5 Division of Prehospital Services, Oslo University Hospital and University of Oslo, Oslo, Norway.
6 University of Vic-Central University of Catalonia, Vic, Spain.