Department of Obstetrics & Gynaecology, Xijing Hospital, Fourth Military Medical University, Xi'an 710033, China;
Department of Obstetrics & Gynaecology, Xijing Hospital, Fourth Military Medical University, Xi'an 710033, China;
Department of Pathology, Fourth Military Medical University, Xi'an 710033,China;
Department of Pathology, Fourth Military Medical University, Xi'an 710033,China;
apoptosis; placenta; pregnancy-induced hypertension syndrome;