0034-7523 0034-7523 S0034-75232021000100013 Cuba 00 03 2021 00 03 2021 60 1

1 2020 2 2020 3 2020 4 2020 73 8 8 674-6 5 2020 6 2020 7 2020 8 2016 33^s1 33^s1 1 9 2020 10 2020