0012-7353 0012-7353 S0012-73532019000300338 10.15446/dyna.v86n210.70738 Ecuador 00 07 2019 00 07 2019 86 210 338 344

[1] 2003 15 5-31 [2] 2009 29 4 4 350-5 [3] 2006 79 1-2 1-2 53-72 [4] 2011 47 5 5 1-12 [5] 2013 103 375-84 [6] 2013 29 35 [7] 2013 6 21-7 [8] 2011 20 19-33 [9] 2006 329 413-21 [10] 2006 91-109 [11] 2009 17 71-84 [12] 2012 48 1-13 [13] 2012 9 2475-510 [14] 2016 8 3 3 1-18 [15] 2016 20 6 6 2421-35 [16] 2016 69 2 2 7919-33 [17] 2011 25 11 11 1784-99 [18] 2009 24 1209-22 [19] 2006 73 207-21 [20] 2015 125 120-8 [21] 2007 43 2 2 264 [22] 2002 18 45-55 [23] 2004 55 487-96 [24] 2001 45 185-207 [25] 2015 35 230-9 [26] 2016 48 673-84 [27] 1998 1-15 [28] 2009 1-38 [29] 2010 318 [30] 1998 [31] 2011 407 164-74 [32] 2010 [33] 2016 30 2930-47 [34] 2016 20 2987-3004