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Panagiotou, O. A., Befano, B. L., Gonzalez, P., Rodríguez, A. C., Herrero, R., Schiller, J. T., Kreimer, A. R., Schiffman, M., Hildesheim, A., Wilcox, A. J., & Wacholder, S. (2015). effect of bivalent human papillomavirus vaccination on pregnancy outcomes: long term observational follow-up in the Costa Rica HPV Vaccine Trial. BMJ, 351, . http://access.bl.uk/ark:/81055/vdc_100151251629.0x000021