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Collection of AEFIs from passive reporting. Spider diagram with 8 axis, each representing the percentage (from 0 to 100%) of YES answers (blue line) referring to the source of passively reported/collected AEFIs. AEFIs = Adverse Event Following Immunizations; VAERS = Vaccine Adverse Event Reporting System. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
