Proposed toxic and hypoxic impairment of a brainstem locus in autism.

Int J Environ Res Public Health · 2013 · PMC3881151 · PMID 24336025

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a strong trendno p-value reported

For example, there is a strong trend in epidemiologic studies suggesting an association of ASDs with exposure to atmospheric mercury and cadmium.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.