1405-9436 1405-9436 S1405-94362019000200306 Ecuador 00 12 2019 00 12 2019 6 50 306 330

2001 2013 2014 1995 2016 2016 2003 2007 2008 2012 2007 2016 2006 2016 1991 2008 283-9 1998 38-49 2000 322-46 2013 2005