0012-7353 0012-7353 S0012-73532019000400049 10.15446/dyna.v86n211.74812 Colombia Colombia 00 12 2019 00 12 2019 86 211 49 53

[1] 2007 6 183-91 [2] 2009 81 109-55 [3] 2010 496 1-45 [4] 2008 77 075422-1-075422-8 [5] 2010 82 2673-700 [6] 2005 438 197-200 [7] 2005 438 201-4 [8] 2006 2 177-80 [9] 2012 100 18 18 [10] 2011 98 [11] 2011 99 022108 022108 [12] 2010 5 655-9 [13] 2015 6 [14] 2011 23 47 47 [15] 2007 7 2 2 238-42 [16] 2011 22 1-6 [17] 2011 84 075420 075420 [18] 1938 424 1 1 211-8 [19] 2015 9 2 2