1816-8949 1816-8949 S1816-89492023000300013 10.18004/anales/2023.056.03.13 Paraguay 00 12 2023 00 12 2023 56 3 13 16 1 1927 1 1 1 5 2 1938 6 11 11 1 3 1948 7 24 24 1 4 1981 13 1 1 13-4 5 2006 39 2 2 8