1817-5996 1817-5996 S1817-59962021000200013 Ecuador Ecuador 00 08 2021 00 08 2021 23 2

1 2018 20 2 2 2 2020 22 3 3 3 2018 34 2 2 278-87 4 2019 23 1 1 114-20 5 2020 24 1 1 6 2020 22 ^s4 ^s4 4 7 2020 8 5 5