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APA Citation
Ying, T., Hong, L., Qi, Z., & Nan, G. (n.d.). oP22.09: Predictive value of cardiovascular parameters in stages I and II of Twin–twin transfusion syndrome. Ultrasound in obstetrics & gynecology, 52, 133. http://access.bl.uk/ark:/81055/vdc_100090056531.0x000040