Surveillance arterioveNous fistulAs using ultRasound (SONAR) trial in haemodialysis patients: a study protocol for a multicentre observational study.

BMJ Open · 2019 · PMC6661628 · PMID 31340975

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did not reach statistical significanceno p-value reported

17 This difference did not reach statistical significance, but notably, the study was powered for a 20% difference in maturation.

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