SETTING:Department of Pediatric Surgery, First Hospital Affiliated to Zhengzhou University.
2
单位：郑州大学第二附属医院神经内科。
SETTING: Department of Neurology of Second Hospital Affiliated to Zhengzhou University.
3
实验材料为郑州大学第一附属医院妇产科住院的健康顺产或剖宫产患者自愿捐献的新生儿无血肿、夹痕的脐带。
Fresh umbilical cords were obtained following delivery of healthy babies to healthy normotensive mothers, either by vaginal delivery or by elective Caesarean section.
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