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. 2018 Feb 10;8(2):e019120. doi: 10.1136/bmjopen-2017-019120

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Elective CS (shown in the upper part), emergency CS (the middle part), emergency CS in a low-risk subgroup (the lower part). Risk-adjusted proportions of 29 maternity units, 2009–2012. Funnel plot limits: 95% and 99.8%. CS, caesarean section; CV, coefficient of variation.