1990-8644 1990-8644 S1990-86442019000400171 Ecuador 00 12 2019 00 12 2019 15 69 171 180

2015 2017 2014 43 2 2 109-11 2013 2 7 7 1988 2016 2007 2015 2013 2018 11 1 1 41-53 2016 2006 3 12-20 2016 25 50 50 2014