2631-2786 2631-2786 S2631-27862020000300151 10.35290/rcui.v7n3.2020.319 Chile 00 12 2020 00 12 2020 7 3 151 171

1981 2012 2018 0 0 8-21 1998 1968 2017 82 82 2000 2006 1994 2010 35 41.52 2018 2020 2003 2006 1999 2017 2008 2010 2005 2004 2004 2002