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APA Citation
Arfi, A., Cohen, J., Canlorbe, G., Bendifallah, S., Thomassin-Naggara, I., Darai, E., Benachi, A., & Arfi, J. (n.d.). first-trimester determination of fetal gender by ultrasound: measurement of the ano-genital distance. European journal of obstetrics, gynecology, and reproductive biology, 203, 177–181. http://access.bl.uk/ark:/81055/vdc_100034881800.0x00001e