“…The studies were conducted in five different countries: six were from the United States [22,23,[25][26][27]30], three from the United Kingdom [20,28,31], two from Canada [21,24], two from Australia [17,19], one from Ireland [18], and one from New Zealand [27,29]. Eight studies examined a variety of attitudes toward vaccines, including barriers [18,[21][22][23]25,[29][30][31], and seven studies sought only to examine barriers to obtaining vaccination [17,19,20,24,[26][27][28]. Table 2 summarizes study and participant characteristics.…”