1390-7697 1390-7697 S1390-76972022000200075 10.26423/rctu.v9i1.664 Ecuador 00 06 2022 00 06 2022 9 1 75 84

2017 2019 38 3 3 1206-63 2020 8 79134-46 2020 2020 2016 2019 12-5 2021 2381-6 2016 59 3 3 211-8 2018 1-5 2018 2017 4644-9 2020 4 1 1 35-9