2550-6587 2550-6587 S2550-65872019000100037 10.33936/rehuso.v4i1.1623 Ecuador 00 04 2019 00 04 2019 4 1 37 46

2014 2018 3 1 1 29-39 2012 14-5 2017 7 2 2 2-11 2006 12 2 2 26-39 2014 2010 5-6 2014 2009 8-9 2013 2016 12-13. 2008 8-9