The role of nocturnal delivery and delivery during the holiday period in Finland on obstetric anal sphincter rupture rates- a population based observational study.

BMC Res Notes · 2010 · PMC2828462 · PMID 20205904

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may be significantno p-value reported

There may be significant differences in teaching status, staff skills and experience and the use of interventions between these two systems.

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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.