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[1]王凤兰主编.中国出生缺陷监测畸形图谱.北京 北京医科大学中国协和医科大学联合出版社 1998.1-6[2]Bonilla-Musoles F Raga F Osborne NG et al.Use of three-dimensional ultrasonography for the study of normal and pathologic morphology of the human embryo and fetus:preliminary report.J Ultrasound Med