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	1.	Extending the time limit for starting the Yuzpe regimen of emergency contraception to 120 hours. [electronic resource] by Ellertson, Charlotte Evans, Margaret Ferden, Sue Leadbetter, Clare Spears, Aileen Johnstone, Karen Trussell, James Producer: 20030703 In: Obstetrics and gynecology vol. 101 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	Estimating the effectiveness of emergency contraceptive pills. [electronic resource] by Trussell, James Ellertson, Charlotte von Hertzen, Helena Bigrigg, Allison Webb, Anne Evans, Margaret Ferden, Sue Leadbetter, Clare Producer: 20030829 In: Contraception vol. 67 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	3.	Differences between emergency contraception users in the United States and the United Kingdom. [electronic resource] by Blanchard, Kelly Haskell, Sue Ferden, Sue Johnstone, Karen Spears, Aileen Evans, Margaret Leadbetter, Clare Carlson, Sarah Meehan, Amy Abuabara, Katrina Ellertson, Charlotte Producer: 20021122 In: Journal of the American Medical Women's Association (1972) vol. 57 Availability: No items available. Save to lists Add to cart (remove)

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