2393-6304 2393-6304 S2393-63042017000100043 10.22235/ao.v14i1.1401 Ecuador Ecuador Ecuador Ecuador 00 07 2017 00 07 2017 14 1 43 49

2014 2015 2005 2003 2006 2007 2014 2 4 4 228-35 2004 3a ed. 2010