1990-8644 1990-8644 S1990-86442020000400015 Ecuador 00 08 2020 00 08 2020 16 75 15 20

2015 2008 7 1 y 2 1 y 2 98-118 2016 2011 2010 2013 2012 38 38 13-123 2014 2016 18 1 1 43-53 2016 2 1 1 2012 13 13 251-67 2016 2011 15 1 1 9-25 1999