| http://www.w3.org/ns/prov#value | - has been suggested as a possible risk factor for ASD. The Children's Environmental Health Centers state that, naturally occurring and synthetic chemicals in the environment, such as lead, mercury and polychlorinated biphenyls (PCBs), have been shown to have neurotoxic effects, and that exposure to neurotoxicants during critical moments of fetal and childhood development can lead to neurodevelo
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