Leaping the hurdles in developing regenerative treatments for the intervertebral disc from preclinical to clinical.

JOR Spine · 2018 · PMC6686834 · PMID 31463447

Europe PMC DOI

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may be significantno p-value reported

In some countries where health is mandated both by state and federal/central government, there may be significant variation among states and different payers.

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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.