Besides a difference in the categorisation of HCWs, studies also differ according to the setting in which they are based, for example hospital vs. community settings (with fewer studies on community-based HCWs) and the country context. [9] [10] [11] 31, 67 While the main conclusions are consistent, an emphasis on the barriers specific to a particular group of HCWs allows for a better understanding of their concerns and the formulation of targeted vaccination campaigns.