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Sørensen, A. M. S., Noergaard, M. M., Gotfredsen, D. R., Kjærbye-Thygesen, A., Jimenez-Solem, E., Askaa, B., Poulsen, H. E., Horwitz, H., & Andersen, J. T. (2022). exposure to Tramadol During Early Pregnancy and Risk of Spontaneous Abortion or Major Congenital Malformations. Obstetrics and gynecology, 139(4), 545–553. http://access.bl.uk/ark:/81055/vdc_100155027446.0x000048