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APA Citation
Padula, F., D'Emidio, L., Coco, C., Sperduti, I., Giannarelli, D., De Paola, D., & Giorlandino, C. (n.d.). p20.07: The "sailing‐sign": a marker of first trimester pulmonary outflow tract. Ultrasound in obstetrics & gynecology, 48, 232. http://access.bl.uk/ark:/81055/vdc_100037125636.0x00003c