Tracking risk.
D002648:Child; D004782:Environmental Health; D006801:Humans; D007223:Infant; D007938:Leukemia / Q000453:epidemiology / Q000209:etiology*; D009369:Neoplasms / Q000453:epidemiology / Q000209:etiology*; D012307:Risk Factors; D014481:United States / Q000453:epidemiology