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- [3] CLINICAL UTILITY OF TWO-DIMENSIONAL DOPPLER ECHOCARDIOGRAPHIC TECHNIQUES FOR ESTIMATING PULMONARY TO SYSTEMIC BLOOD-FLOW RATIOS IN CHILDREN WITH LEFT TO RIGHT SHUNTING ATRIAL SEPTAL-DEFECT, VENTRICULAR SEPTAL-DEFECT OR PATENT DUCTUS-ARTERIOSUS [J]. JOURNAL OF THE AMERICAN COLLEGE OF CARDIOLOGY, 1984, 3 (01) : 169 - 178