Coccygectomy for Coccygodynia: A Single Center Experience Over 5 Years.

Asian J Neurosurg · 2018 · PMC5898092 · PMID 29682021

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may be significantno p-value reported

History may be significant for a recent trauma with an acute onset of pain, or the onset of pain may have been insidious with no clear inciting factor.

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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.