1729-519X 1729-519X S1729-519X2021000400020 Peru 00 08 2021 00 08 2021 20 4 1 2020 19 1 1 69-77 2 2021 20 2 2 3 2019 12 4 4 21-33 4 2008 117 3 3 354-73 5 2019 58 243-66 6 2020 35 3 3 119-32 7 2019 2 1 1 655-68