Application of biologic markers to studies of environmental risks in children and the developing fetus.

Environ Health Perspect · 1995 · PMC1518899 · PMID 8549455

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highly significantno p-value reported

A highly significant association was found between decreased birth weight and the level of smoking- related adducts in placental tissue collected from only 30 smoking mothers (53).

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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.