0864-3466 0864-3466 S0864-34662018000200295 Ecuador Cuba 00 06 2018 00 06 2018 44 2 295 311

1 2008 2 1995 3 2007 4 2011 5 2011 6 2013 39 915-28 7 2010 8 1980 9 2014 10 2010 20 1 1 11 2001 12 2011 13 2011 13 1 1 14 2010 15 2011 16 2009 17 2011 10 20 20 1-21