O. A. dos Santos, A. L. V. Borges, C. B. do N. Chofakian, and K. C. M. Pirotta, “ Determinants of emergency contraception non-use among women in unplanned or ambivalent pregnancies ”, Rev. Esc. Enferm. USP, vol. 48, no. spe, pp. 16–22, Aug. 2014, doi: 10.1590/S0080-623420140000600003.