Fig. 3From: Bibliometric analysis of global scientific literature on vaccine hesitancy in peer-reviewed journals (1990–2019)Annual growth of publications on vaccine hesitancy (1990–2019) from the six different WHO world regions. Green line = the region of the Americas; the purple line = the European region; the black line = the Western Pacific region; the blue line = the African region; the light red line = South-East Asian region; and finally the dark red line = the Eastern Mediterranian regionBack to article page