1 Department of Anesthesia and Intensive Care, IRCCS San Raffaele Scientific Institute, Milan, Italy; Medical University of Graz, Neue Stiftingtalstraße 6, Graz, Austria; Department of Health Studies, FH Joanneum University of Applied Sciences, Graz, Austria.
2 Department of Anesthesia and Intensive Care, IRCCS San Raffaele Scientific Institute, Milan, Italy; Division of Prehospital Services, Oslo University Hospital, Oslo, Norway. Electronic address: kellings@ous-hf.no.
3 Department of Anesthesia and Intensive Care, IRCCS San Raffaele Scientific Institute, Milan, Italy.