2521-2281 2521-2281 S2521-22812021000200057 10.52379/mcs.v5i2.206 Paraguay Paraguay Paraguay 00 08 2021 00 08 2021 5 2 57 58 1 2017 63 5 5 387-8 2 2018 1 3 3 190-1 3 2005 11 2 2 127-32 4 2010 9 1 1 127-39 5 2012 140 6 6 789-96