0034-7531 0034-7531 S0034-75312019000300001 Cuba 00 09 2019 00 09 2019 91 3 1 2018 24 1 1 37-56 2 2012 5th 3 2013 3 4 4 342 4 2015 38 5 2015 169 8 8 778-82