1817-5996 1817-5996 S1817-59962022000400012 Ecuador 00 12 2022 00 12 2022 24 4

1 2020 18 3 3 496-506 2 2020 26 4 4 3 2020 34 2 2 4 2020 34 3 3 5 2019 33 2 2 6 2020 34 2 2 7 2021 35 1 1 8 2020 34 3 3 9 2021 35 1 1