2218-3620 2218-3620 S2218-36202020000100396 Ecuador 00 02 2020 00 02 2020 12 1 396 403

2000 1999 2003 2010 1 1 1 37-57 2012 1996 2010 8 2 2 47-73 2000 17 24-32 2015 29-40 2012 10 1 1 105-22