“…The studies derived from Australia ( n = 5), 25,26,28,32,37 Canada ( n = 2), 17,21 Finland ( n = 1), 36 Germany ( n = 4), 24,38,43,44 the United Kingdom ( n = 5) 20,22,29,30,31 and the United States ( n = 6) 27,34,39,40,41,42 between 2009 and 2020. Study methodologies varied and included qualitative ( n = 7), 17,20,26,29,30,39,42 quantitative non-randomised ( n = 3), 25,36,44 quantitative descriptive ( n = 8) 22,24,28,34,38,40,41 and mixed-methods studies ( n = 5). 17,27,31,32,37 Sample sizes of the included studies were between 5 and 4348 participants; the majority of participants were ambulance staff ( n = 20), 17,20–22,24,26–32,34,37…”