“…Fifty-five percent (n = 11) of studies [17][18][19]21,23,24,26,29,30,34,35 described training Tier-1 first responders, 25% (n = 5) of studies 20,22,27,32,33 focused on Tier-2 first responders, and 20% (n = 4) of studies 16,25,28,31 covered both Tier-1 and Tier-2. Commonly reported occupations of Tier-1 first responders included taxi drivers (30% of studies, n = 6), commercial drivers (20%, n = 4), police (20%, n = 4), firefighters (20%, n = 4), and military personnel (10%, n = 2).…”