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World Health Organization (WHO) classification of maternal cardiovascular risk
AS: aortic stenosis, ASD: atrial septal defect, CHD: congenital heart disease, EF: ejection fraction, LV: left ventricle, MS: mitral stenosis, NYHA: New York Heart Association, PAPVR: partial anomalous pulmonary venous return, PDA: patent ductus arteriosus, VSD: ventricular septal defect
