1990-8644 1990-8644 S1990-86442021000100127 Ecuador 00 02 2021 00 02 2021 17 78 127 133

2008 4 1 1 1-8 2000 2013 3 1 1 36-50 2009 2014 2013 2016 2007 6 2 2 2015 2000 2007 2016 2014