| http://www.w3.org/ns/prov#value | - Although vaccinations have been the primary source of exposure to thimerosal in childhood, a small proportion of young children during the study period would have had additional thimerosal exposure in utero through maternal immunization during pregnancy with vaccines or Rho(D) immune globulin.33 Similarly, sources of methylmercury exposure such as fish or human milk could not be evaluated.
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