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	1.	Erroneous production of PAPP-A kits: the impact of a downward shift in PAPP-A concentration on the test performance of first-trimester combined screening for Down syndrome. [electronic resource] by van Heesch, P N A C M de Rijke, Y B Laudy, J A M Wildschut, H I J Producer: 20111201 In: Prenatal diagnosis vol. 31 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	First-trimester crown-rump length and embryonic volume of aneuploid fetuses measured in virtual reality. [electronic resource] by Baken, L van Heesch, P N A C M Wildschut, H I J Koning, A H J van der Spek, P J Steegers, E A P Exalto, N Producer: 20131028 In: Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology vol. 41 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)

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