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APA Citation
Chougrani, I., Muller, F., Marcelin, L., Tsatsaris, V., Abric, J., Luton, D., Guibourdenche, J., & Azria, E. (n.d.). combined first-trimester Down syndrome screening in HIV-infected women. European journal of obstetrics, gynecology, and reproductive biology, 203, 274–278. http://access.bl.uk/ark:/81055/vdc_100034881800.0x00001c