2312-3893 2312-3893 S2312-38932021000200009 10.18004/rvspmi/2312-3893/2021.08.02.09 Paraguay 00 09 2021 00 09 2021 8 2 9 10 1 2013 5 7 7 2502-21 2 2020 8 7 7 570 3 2019 116S S131-7 4 2021 Jul 26 5 2021 8 2 2 76-88 6 2020 8 9 9 735-6 7 2020 12 11 11