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APA Citation
Yum, S. K., Moon, C., Youn, Y., Lee, J. Y., & Sung, I. K. (2018). echocardiographic assessment of patent ductus arteriosus in very low birthweight infants over time: prospective observational study. Journal of maternal-fetal & neonatal medicine, 31, 164–172. http://access.bl.uk/ark:/81055/vdc_100053607352.0x000010