2550-6722 2550-6722 S2550-67222020000100130 10.37135/chk.002.10.09 Ecuador Ecuador 00 04 2020 00 04 2020 10 130 143

1980 1965 2009 2000 2007 2004 4 4 4 74 1993 1964 1994 2012 8 3 3 65 1966 1974 1978 2014 184 31 2003 1979 1996