1817-5996 1817-5996 S1817-59962021000300002 Peru Perú Bolivia 00 12 2021 00 12 2021 23 3 1 2021 23 1 1 2 2018 79 4 4 351-9 3 2019 45 3 3 4 1998 7 289-94 5 2017 15 1 1 134-53