1561-3194 1561-3194 S1561-31942020000600007 Cuba 00 12 2020 00 12 2020 24 6

1 2020 10 2 2 2 2017 3 2020 1.0 4 2020 5 2020 6 2020 7 2020 8 2020 9 2020 18 3 3 452-6 10 2020 11 2020 12 2020 13 2020 14 2020 15 2020