2550-6722 2550-6722 S2550-67222019000100094 Ecuador 00 04 2019 00 04 2019 7 94 103

1997 2001 2004 12 2 2 1-5 1979 1991 1981 2004 11 31 31 0 2002 9 30 30 2015 15 22 22 41-59 1990 2009 2007 2 4 4 151-5 2001 XIX 3 3 857-60 1998 25-41