Santos, R. V. dos, A. R. R. Pereira, C. R. O. de P. Lima, D. de S. Dantas, and C. W. S. Ferreira. “Perineal Trauma in Nulliparous Women and Its Associated Factors”. ABCS Health Sciences, vol. 46, Nov. 2021, p. e021224, doi:10.7322/abcshs.2020047.1496.