0121-8123 0121-8123 S0121-81232020000400319 10.1016/j.rcreu.2019.10.008 Colombia Colombia Colombia Colombia 00 12 2020 00 12 2020 27 4 319 320 1 2017 43 503-18 2 2012 380 767-77 3 2015 67 1637-45 4 2013 2013 940438 5 2010 30 123-30 6 2001 45 184-5