2528-7907 2528-7907 S2528-79072019000400072 Ecuador 00 06 2019 00 06 2019 1 31 72 79

1991 1999 2015 2016 2012 1956 2014 9 1 1 43 -46 1993 2015 35 5 5 13-21 2003 2009 2017 26 1999 2015 2014 2003 2017 13 37 37 41-55 2014 2016 30 3