https://www.selleckchem.com/pr....oducts/fenretinide.h
NA.Objective To study the correlation between the duration of labor and postpartum hemorrhage. Methods The delivery data of singleton first-term pregnant women who delivered vaginally at Beijing Obstetrics and Gynecology Hospital from January 1, 2017 to December 31, 2017 were collected, 3 104 cases met inclusion criteria. According to the duration of the first labor (t), they were divided into two groups t≥8 hours was the observation group, t less then 8 hours was the control group. In order to ensure the baseline characteristics of
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