1990-8644 1990-8644 S1990-86442019000200183 Ecuador 00 06 2019 00 06 2019 15 67 183 189

2010 2006 58 41-60 2017 5 1 1 109-17 2018 39 39 39 2006 10 38-53 2011 3 7 7 2003 2014