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APA Citation
Peragallo Urrutia, R., Polis, C. B., Jensen, E. T., Greene, M. E., Kennedy, E., & Stanford, J. B. (2018). effectiveness of Fertility Awareness–Based Methods for Pregnancy Prevention. Obstetrics and gynecology, 132(3), . http://access.bl.uk/ark:/81055/vdc_100085769675.0x000054