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APA Citation
Stratulat, V., Melamed, N., Barrett, J., Nevo, O., Hack, K., & Ronzoni, S. (2021). validation of upsilon (Y) zone as pathognomonic ultrasound landmark for chorionicity and amnionicity in triplet pregnancy at any gestational age. Ultrasound in obstetrics & gynecology, 57, 501–503. http://access.bl.uk/ark:/81055/vdc_100123984120.0x000016