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机译:Echogenic intracardiac focus: a sonographic sign for fetal Down syndrome.
Department of Obstetrics and Gynecology, Massachusetts General Hospital, Boston, USA.;
Down Syndrome; Echocardiography; Fetal Diseases; Ultrasonography; Prenatal; 唐氏综合征; 超声心动描记术; 胎儿疾病; 超声检查; 产前;