1608-8921 1608-8921 S1608-89212019000200008 Cuba 00 08 2019 00 08 2019 21 2 8 12 1 2016 17 2 2 93-106 2 2014 55 2 2 200-10 3 2016 15 4 4 651-9 4 1999 3 2 2 5 2010 49 4 4 94-108 6 2017 32 12-21