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https://scholar.google.com/scholar_lookup?title=Childhood%20blood%20lead%20levels&author=Niggs,+J.T.&publication_year=2010&journal=J.+Child+Psychol.+Psychiatry&volume=51&pages=58%E2%80%9365&doi=10.1111/j.1469-7610.2009.02135.x