Pharmacologic prophylaxis for atrial fibrillation following cardiac surgery: a systematic review.

J Cardiothorac Surg · 2010 · PMC3006380 · PMID 21118555

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highly significantno p-value reported

They also found a highly significant reduction in relative risk with the addition of magnesium.

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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.