Effects of power frequency electromagnetic fields on melatonin and sleep in the rat.

Emerg Health Threats J · 2012 · PMC3334267 · PMID 22529876

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marginally statistically significantno p-value reported

Conclusions Power frequency magnetic fields induced a marginally statistically significant increase in melatonin levels in exposed rats compared to control.

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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.