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APA Citation
Baer, R. J., Lyell, D. J., Norton, M. E., Currier, R. J., & Jelliffe-Pawlowski, L. L. (n.d.). first trimester pregnancy-associated plasma protein-A and birth weight. European journal of obstetrics, gynecology, and reproductive biology, 198, 1–6. http://access.bl.uk/ark:/81055/vdc_100096851871.0x00004a