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The original 2015 study of Hurley records involved a total of 1,473 children "younger than 5 years" whose address could be mapped to a site inside Flint in two pre/post 8.5 month periods. The 2018 study, led by Hernán F. Gómez, involved 15,817 children "aged ≤ 5 years" over the 11-year period 2006–2016.