2528-7907 2528-7907 S2528-79072018000400136 Ecuador Ecuador Ecuador Ecuador 00 12 2018 00 12 2018 1 28 136 145

2013 2010 2015 2014 2018 2009 2016 2013 2017 2011 OJS 2010 Open Access 2010 PKP 2005 2017 2002 2017 2017 2016 2005 23 4 4 504-19