User:Yebra1031/sandbox

Sources:
Diagnosis and Management of Placenta Previa https://www.ncbi.nlm.nih.gov/pubmed/17346497

Etiology and Risk Factors http://www.tandfonline.com/doi /abs/10.1080/jmf.13.3.175.190

http://onlinelibrary.wiley.com/store/10.1111/tmi.12100/asset/tmi12100.pdf?v=1&t=jamfwbgg&s=c157d57542e6f0a4f33e3f4d207464668fe79c4c&systemMessage=Wiley+Online+Library+usage+report+download+page+will+be+unavailable+on+Friday+24th+November+2017+at+21%3A00+EST+%2F+02.00+GMT+%2F+10%3A00+SGT+%28Saturday+25th+Nov+for+SGT+

https://www.ncbi.nlm.nih.gov/pubmed/29046070