Zapata, B., Ramírez, J., Pimentel, J., Cabrera, S. and Campos, G. 2015. Previous pelvic surgery and ectopic pregnancy in the epidemiology of ectopic pregnancy. The Peruvian Journal of Gynecology and Obstetrics . 61, 1 (May 2015), 27–32. DOI:https://doi.org/10.31403/rpgo.v61i411.