The answer is 17 years, what is the question: understanding time lags in translational research.

J R Soc Med · 2011 · PMC3241518 · PMID 22179294

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a clear trendno p-value reported

There is a clear trend in the literature to seek a single answer to a single question through the calculation of an average.

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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.