2550-6722 2550-6722 S2550-67222017000200006 Ecuador Ecuador Ecuador 00 12 2017 00 12 2017 3 6 19

2005 22 22 49-60 2015 2013 2007 1997 2002 1982 2016 2007 2009 2010 2000 1997 26 26 385-409 2013 62 62 69-87 2009 2008 2002 2007 1999 1996