0186-2391 0186-2391 S0186-23912018000300282 10.18233/apm39no3pp282-2831613 Peru 00 06 2018 00 06 2018 39 3 282 283 1 2012 141 2-18 2 2018 39 1 1 13-22 3 2016 38 8 8 1-12 4 2016 5 1992 112 155-9 6 2009 40 532-8