2631-2581 2631-2581 S2631-25812017000200191 Ecuador Ecuador USA 00 12 2017 00 12 2017 26 3 191 193

2004 261 445-8 2002 25 856-62 2014 23 1030- 1039 2015 24 7-8 2014 9 367-71 2008 118 275-8 2014 21 289-92