0034-7493 0034-7493 S0034-74932019000300008 Ecuador 00 09 2019 00 09 2019 58 3

1 2009 47 4 4 2 2014 19 479-83 3 2016 22 41-2 4 2017 10 731-3 5 1998 8 376-7 6 2015 35 2 2 173-5 7 2015 35 1 1 32-7 8 2013 55 2 2 14-6 9 2017 12 1 1 23-9