1405-9940 1405-9940 S1405-99402019000100085 10.24875/acm.m19000003 Perú 00 03 2019 00 03 2019 89 1 85 87 1 2008 118 2754-62 2 2005 111 472-9 3 2016 37 2823-9 4 2015 373 929-38 5 2017 135 2426-41 6 2004 68 77-81