0034-7434 0034-7434 S0034-74342020000300008 10.18597/rcog.3545 Peru Peru Perú Peru 00 09 2020 00 09 2020 71 3 297 299 1 D'Alton M.Goffman D 2020 382 2163-4 2 2020 3 2020 4 2020 5 2020 323 18 18 1846-8 6 2020 7 2020 2 3 3 8 2020 145 6 6 9 2020 395 10226 10226 809-15