1028-9933 1028-9933 S1028-99332020000600512 Cuba 00 12 2020 00 12 2020 99 6 512 514 1 2019 2 2018 33 3 3 150-70 3 2019 61 3 3 4 2018 20 1 1 41-56 5 2017 52 3 3 276-83 6 2019 7 2019 31 4 4 327-9