0034-7531 0034-7531 S0034-75312019000100001 Cuba 00 03 2019 00 03 2019 91 1 1 2009 20 2 2 2 2009 81 sup sup 18-9 3 2018 90 1 1 169-84 4. 2019 5 2016 14 2 2 180-8 6 2018 90 1 1 1-3