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  1. Excluded Studies - Management of Postpartum Hemorrhage - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK294466
    ... et al. Maternal morbidity during childbirth hospitalization in California. J Matern Fetal Neonatal Med. 2012 Dec; 25 :2529–35. X-4. [ PMC free article : PMC3642201 ] [ PubMed : 22779781 ] 2259. Ma J, Shao H, Lu X, et al. Safety and efficacy of airbag midwifery in promoting normal ...