Faiz, AS; Ananth, CV (March 2003). “Etiology and risk factors for placenta previa: an overview and meta-analysis of observational studies.”. 《The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians》 13 (3): 175–90. doi:10.1080/jmf.13.3.175.190. PMID12820840.
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ncbi.nlm.nih.gov
Faiz, AS; Ananth, CV (March 2003). “Etiology and risk factors for placenta previa: an overview and meta-analysis of observational studies.”. 《The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians》 13 (3): 175–90. doi:10.1080/jmf.13.3.175.190. PMID12820840.