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To evaluate the efficacy of the sonographic cardiothoracic ratio (CTR) in early pregnancy for the prediction of fetal haemoglobin (Hb) Bart's disease.Over a 1.5-year period at a Chinese tertiary obstetric centre, women at risk of Hb Bart's disease were given the option of a non-invasive approach to exclude an affected pregnancy between 11 weeks and 13 weeks and 6 days of gestation, with a routine...
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