Reducing corruption in a Mexican medical school: impact assessment across two cross-sectional surveys.

BMC Health Serv Res · 2011 · PMC3332557 · PMID 22376281

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a decreasing trendno p-value reported

It could also reflect a decreasing trend of paying for examinations over time.

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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.