Figure 1.

Flowchart for retrieval of articles. ^a Records excluded: Did not evaluate COVID-19 related vaccine hesitancy (n = 1425); Evaluated vaccine hesitancy in non-high-income countries (n = 34); non-English articles (n = 23); irrelevant systematic reviews/meta-analyses (n = 3); ^b Records excluded: Studies included countries other than high-income countries (n = 14); studies are editorials, commentaries, news article and/or opinions without original data (n = 132); Study looked at willingness of guardians enrolling children in vaccine trials (n = 1); studies retracted (n = 3).