1390-9274 1390-9274 S1390-92742019000200031 10.18537/est.v008.n016.a02 Ecuador Ecuador 00 12 2019 00 12 2019 8 16 31 53

2007 25-34 1987 1948 2006 2010 2001 1967 1971 82 30-3 2016 189 17-50 1968 2007 2011 1999 1987 1999 1999 1996 1998 2003 40-5