0034-7523 0034-7523 S0034-75232021000400023 Cuba Cuba 00 12 2021 00 12 2021 60 4

1 2019 17 4 4 2 2020 10 2 2 3 2020 18 1 1 4 2018 16 3 3 5 2017 56 2 2 6 2020 59 4 4