0034-7523 0034-7523 S0034-75232019000200001 Cuba 00 06 2019 00 06 2019 58 2 1 2012 73 1 1 21-6 2 2015 37 6 6 648-53 3 2016 95 2 2 234-42 4 2016 20 02 02 253-8 5 2017 12 1 1 39-44 6 2018 7 27 27 25-34