1990-8644 1990-8644 S1990-86442022000100030 Ecuador 00 02 2022 00 02 2022 18 84 30 39

2018 2017 2019 33 2 2 2020 39 1 1 2021 35 5 5 473-779 2017 18 1 1 1-9 2016 32 9 9 997-1006 2013 579-95 2010