1794-4449 1794-4449 S1794-44492018000200327 10.22507/rli.v15n2a25 Ecuador Ecuador 00 12 2018 00 12 2018 15 2 327 339

1996 2012 2010 2014 2018 2 16 16 2000 2013 2010 2000 29 2004 2015 2 15 15 1999 2013 2010 1994 2002 2011 2006 Unabvirtual 2013