不同孕周脐带绕颈胎儿脐动脉及大脑中动脉血流参数的变化研究
불동잉주제대요경태인제동맥급대뇌중동맥혈류삼수적변화연구
Changes of the blood flow parameters in umbilical cord surrounding the fetal neck and middle cerebral artery during different gastational age