0864-0289 0864-0289 S0864-02892021000400019 Cuba 00 12 2021 00 12 2021 37 4 1 2016 50 1 1 55-63 2 2014 80 2 2 122 3 2018 38 5 5 558-68 4 2017 49 79-86 5 2019 35 4 4 6 2015 15 9 9 53 7 2017 33 2 2