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. 2023 Apr 26;39(7):1813–1819. doi: 10.1007/s00381-023-05945-w

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Fig. 1 — Neural tube defects per 100,000 live births per quarter before and after the voluntary folate fortification of corn masa flour. Solid black: actual number of NTDs per 100,000 live births. Blue dashed line: projected number of NTDs per 100,000 live births. Shaded blue region: confidence interval for projection. Dashed grey line: border between before and after implementation periods