“…4). 8,9,15,18,19,22,23,27,29,35,36,39,42,[44][45][46]49,51,52,58,61,62,65,67,71,74,81 Several studies investigated the prevalence of CPR training in the same population and geography in different study periods. These studies were carried out in four countries: Australia, China, Japan, and South Korea.…”