0012-7353 0012-7353 S0012-73532020000400180 10.15446/dyna.v87n215.84282 Ecuador Ecuador 00 12 2020 00 12 2020 87 215 180 185

[1] 1994 7 10 10 1213-41 [2] 1987 2 235-53 [3] 2007 205-11 [4] 2005 18 18 1135-41 [5] 2013 42 42 29-35 [6] 1990 [7] 1999 16 3 3 37-43 [8] 2000 13 10 10 1177-81 [9] 1984 125-44 [10] 1991 4 4 1043-55 [11] 2000 58 1 1 61-80 [12] 1999 12 8 8 851-62 [13] 2011 [14] 1987 19 1 1 95-115 [15] 1998 36 9 9 1299-308 [16] 2009 139-44 [17] 2006 2 [18] 2016 2 885-907 [19] 1998 11 10 10 919-27 [20] 2016 48 3 3 276-87 [21] 2007 [22] 2015 [23] 1993