2218-3620 2218-3620 S2218-36202019000400163 Ecuador 00 12 2019 00 12 2019 11 4 163 170

2014 2000 2010 2018 34 1 1 24 2013 2018 16 16 16 199-219 2015 2015 2003 2016 20 2 2 1-20 2018 2018 2007 2014 2017 2018