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APA Citation
Liu, Y., Ye, X., Zhang, N., Zhang, B., Guo, C., Huang, W., Jing, L., Wang, M., Yang, G., Wei, X., & Jing, C. (n.d.). diagnostic value of ultrasonographic combining biochemical markers for Down syndrome screening in first trimester: a meta‐analysis. Prenatal diagnosis, 35, 879–887. http://access.bl.uk/ark:/81055/vdc_100026331018.0x000018