0034-7531 0034-7531 S0034-75312021000100019 Cuba Cuba 00 03 2021 00 03 2021 93 1 1 2020 92 ^sespecial ^sespecial especial 2 2020 183 71-7 3 2020 83 1 1 e61-3 4 2020 12 2 2 129-37 5 2020 24 4 4 6 2020 45 4 4 7 2020 8 2020 22 3 3 64-8 9 2020 34