1390-8626 1390-8626 S1390-86262017000200083 10.17163/soph.n23.2017.02 Ecuador Ecuador Ecuador 00 12 2017 00 12 2017 23 83 89

2006 2003 1996 1985 1985 1973 2001 1986 1997 2000 2007 2008 1994 2006 2009 2008 2009 1997 2000