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APA Citation
Khalil, A., Coates, A., Papageorghiou, A., Bhide, A., & Thilaganathan, B. (n.d.). biparietal diameter at 11–13 weeks' gestation in fetuses with open spina bifida. Ultrasound in obstetrics & gynecology, 42, 409–415. http://access.bl.uk/ark:/81055/vdc_100043943271.0x000001