Value of ultrasound measurement of umbilical artery PI, RI, S/D combined with serum HIF-1α, FE3 in the diagnosis of fetal distress and its correlation with the severity of the disease
YANG Xin-yu, YE Qian, GUO Jiang
Journal of Hebei Medical University . 2021, (12): 1437 -1441 .  DOI: 10.3969/j.issn.1007-3205.2021.12.015