2218-3620 2218-3620 S2218-36202018000500274 República del Ecuador 00 12 2018 00 12 2018 10 5 274 279

2015 12 2 2 59-72 2016 40 184-202 2012 7 14 14 69-80 2013 58 1 1 251-88 2017 8 2 2 144-57 2016 40 129-58 1993 3 3 3 7-10 2015 117 34-49 2014 5 11 11 70-7