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- Estimating the incidence and the economic burden of third and fourth-degree obstetric tears in the English NHS: an observational study using propensity score matchingMartina Orlovic, Alexander William Carter, Joachim Marti, Elias MossialosBMJ Open Jun 2017, 7 (6) e015463; DOI: 10.1136/bmjopen-2016-015463
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