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APA Citation
Walker, N. E., Filis, P., O'Shaughnessy, P. J., Bellingham, M., & Fowler, P. A. (n.d.). maternal smoking and fetal sex influence expression of human placental nutrient transporters. Placenta, 57, 324–. http://access.bl.uk/ark:/81055/vdc_100049906815.0x000023