Iron, meat and health.

Nutrients · 2011 · PMC3257743 · PMID 22254098

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highly significantno p-value reported

There were highly significant differences in the predicted efficiency of iron absorption from six equations and none agreed with dietary iron utilization based on improvement in serum ferritin concentration. 13.3.

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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.