Low lead levels and mental retardation.
D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D008607:Intellectual Disability / Q000097:blood / Q000209:etiology*; D007854:Lead / Q000097:blood* / Q000633:toxicity; D007855:Lead Poisoning / Q000150:complications
D007854:Lead