“…[13-18, 20-33, 35, 37, 38, 43, 44, 46-52, 55, 58-60] The studies identi-fied with randomization, [19,34,56,57] level III, represented the second most frequent type of study (10.20%, 5/49). The studies found with a higher level of evidence, level II, [41,45,53,54] The publications were grouped according to similarity criteria into four categories: (i) vaccine coverage (42.86%, 21/49), (ii) vaccine administration (28.58%, 14/49), (iii) vaccination (14.28%, 7/49), (iv) management/supervision (14.28%, 7/49) (see Figure 3).…”