1990-8644 1990-8644 S1990-86442019000500370 Ecuador 00 10 2019 00 10 2019 15 70 370 375

2017 22 73-9 2018 2019 11 4 4 393-401 2019 2006 60 2 2 152-63 2012 35 353-60 2017 13 1 1 15-23 2019 2015 191 2355-8