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Heightened areas of relative risk in Utah by birth cohort and surveillance year: A) children born in 2000 and ascertained in SY2006 at six years of age (2000–6 sample; diagonal hatch) and SY2008 at eight years of age (pink; 2000–8 sample), and B) children born in 2002 and ascertained in SY2006 at four years of age (2002–4 sample; diagonal hatch) and SY2008 at six years of age (2002–6 sample; blue).
