5Mehrabadi A, Liu S, Bartholomew S, et al. Temporal trends inpostpartum hemorrhage and severe postpartum hemorrhage in Canada12345from 2003 to 2010[J]. J Obstet Gynaecol Can,2014;36(1):21-33.
6Gupta A. A comparative study of methylergonovine and 15-methyoprostaglandin F2α in active management of third stage oflabor[J]. Obstet Gynecol Sci,2013;56(5):301-306.