1134-8046 1134-8046 S1134-80462019000500012 10.20986/resed.2018.3659/2018 Chile Chile 00 10 2019 00 10 2019 26 5 315 316 2012 40 2 2 75-84 2012 2005 49-50 2016 18 2 2 296-309