1657-6276 1657-6276 S1657-62762020000100001 Colombia 00 06 2020 00 06 2020 48 1 1 2005 6 3 3 193-209 2003 1992 19 2 2 155-79 1982 9 2 2 132-40 1997 26 2 2 35-45 1999 2009 2017 1995 22 22 537-42 1980 39 6 6 1161-78