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APA Citation
Kuleva, M., Fries, N., Castaing, O., Moeglin, D., & Salomon, L. J. (n.d.). 'Flash study' on chorionicity determination from ultrasound images at 11–14 weeks' gestation in twin pregnancies. Ultrasound in obstetrics & gynecology, 41, 471–472. http://access.bl.uk/ark:/81055/vdc_100039446669.0x000001