1560-4381 1560-4381 S1560-43812019000401314 Ecuador Ecuador Ecuador 00 12 2019 00 12 2019 23 4 1314 1332

1 2011 2 1974 3 2014 1 3ra 4 2001 22 3 3 215-21 5 1968 6 2015 7 8 1990 9 2018 10 2008 6 1 1 11 12 M acAloon J 1975 13 2010 14 65-79