2224-7920 2224-7920 S2224-79202019000200054 Cuba 00 08 2019 00 08 2019 31 2 54 56 2014 36 2 2 106-10 2017 4 1 1 3-12 2006 2012 34 3 3 184-7 2015 37 1 1 57-63 2015 187-216 2004 85 6 6 231-4