0034-7531 0034-7531 S0034-75312018000400001 Cuba 00 12 2018 00 12 2018 90 4 1 2016 15 3 3 2 2015 17 2 2 124-33 3 1954 71-102 4 1976 295 1029-33 5 2017 73 59-63 6 2017 135 95-101 7 1957 96 158-63 8 1978 2 726-8 9 1984 10 2014 24 11 2015 37 9 9 868-73 12 2017 22