Basis of the Massachusetts reference dose and drinking water standard for perchlorate.

Environ Health Perspect · 2010 · PMC2831965 · PMID 20056583

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may be significantno p-value reported

However, the level of IUI necessary to cause deleterious downstream effects is unknown, and the available data suggest that small increments in IUI may be significant.

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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.