A randomized controlled trial of a personalized feedback intervention for problem gamblers.

PLoS One · 2012 · PMC3279405 · PMID 22348112

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may be significantno p-value reported

However, it is difficult to ascertain what differences may be significant from these studies.

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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.