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APA Citation
Skorupskaite, K., Walker, J., & Stock, S. (n.d.). modeling chorionic villus sampling technique: influence of number of needle 'passes' on quantity of chorionic villi obtained. Ultrasound in obstetrics & gynecology, 41, 592–593. http://access.bl.uk/ark:/81055/vdc_100038944346.0x000001