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WikiPedia: Màng ngăn âm đạo http://www.ortho-mcneilpharmaceutical.com/ortho-mc... //www.ncbi.nlm.nih.gov/pubmed/14727824 //www.ncbi.nlm.nih.gov/pubmed/14744659 http://www.who.int/medicines/publications/essentia... http://www.aafp.org/afp/20040101/97.html //dx.doi.org/10.1363%2F3527003 http://www.fwhc.org/birth-control/diaphram.htm http://www.plannedparenthood.org/birth-control-pre... https://books.google.com/books?id=2X03PXd4JSoC&lpg... https://books.google.com/books?id=30EzZPp1ypYC&lpg...