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APA Citation
Simon, E., Arthuis, C., Haddad, G., Bertrand, P., & Perrotin, F. (n.d.). oP13.09: A biparietal / transverse abdominal diameter (BPD/TAD) ratio ≤1: a potential hint for open spina bifida at 11–13 weeks scan. Ultrasound in obstetrics & gynecology, 44, 94. http://access.bl.uk/ark:/81055/vdc_100024916759.0x00001e