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APA Citation
Trapani, A., Trapani, T., Silveira, S., Franco, M., Feurschuette, O., Galuzzo, R., & Pires, M. (n.d.). oC17.03: Comparison of the effect of sildenafil and nitroglycerin on Doppler in pregnancies complicated by placental insufficiency and fetal growth restriction. Ultrasound in obstetrics & gynecology, 44, 40. http://access.bl.uk/ark:/81055/vdc_100024916656.0x000017