1996-2452 1996-2452 S1996-24522021000300934 Ecuador Ecuador Ecuador Ecuador Ecuador 00 12 2021 00 12 2021 16 3 934 946

2009 16 16 1-10 2010 2000 Ministerio de Educación 2020 1991 2020 12 26 26 1-12 2018 2020 24 3 3 1-18 2020 15 3 3 2020 15 2 2 371-81 2021 2021 16 2 2 564-75 2006 2015 2015