Endocrine surgery as a model for value-based health care delivery.

Surg Neurol Int · 2012 · PMC3551507 · PMID 23372979

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an overall trendno p-value reported

The aggregate market share of the top eleven highest-volume hospitals increased from 25% to 42%, reflecting an overall trend toward case concentration in high-volume centers.

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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.