0034-7523 0034-7523 S0034-75232021000400003 Cuba 00 12 2021 00 12 2021 60 4 1 2017 59 3 3 2 2019 37 11 11 2116-22 3 2020 76 1649-55 4 2016 39 21-7 5 2003 290 21 21 2805-16