Diarrhea outbreak during U.S. military training in El Salvador.

PLoS One · 2012 · PMC3399860 · PMID 22815747

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an increasing trendno p-value reported

We identified an increasing trend of diarrheal illness occurring throughout the course of the operation and an association with the consumption of food sold from local vendors on-base.

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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.