2477-9105 2477-9105 S2477-91052019000100078 10.47187/perf.v2i22.67 Ecuador 00 12 2019 00 12 2019 2 22 78 86

2015 2016 1 1 1 86-94 2015 2013 1 1 1 48-9 2016 2013 2012 7 14 14 64-73 2018 2000 2002 2016 2017