1990-8644 1990-8644 S1990-86442022000400373 Ecuador 00 08 2022 00 08 2022 18 87 373 378

2005 2017 8 2 2 1-7 2004 2008 6 1 1 34-43 2019 17 1 1 1-16 2009 9 1 1 1-17 2021 13 1 1 89-95 1986 2005 2021 22 1 1 20-6 1997