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URL: www.sciencedire ... http://www.sciencedirect.com/science/journal/00207292
URL: obgyn.onlinelib ... http://obgyn.onlinelibrary.wiley.com/hub/journal/10.1002/(ISSN)1879-3479/
Wikipedia: en.wikipedia.or ... https://en.wikipedia.org/wiki/International_Journal_of_Gynecology_%26_Obstetrics
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