0034-7493 0034-7493 S0034-74932021000200001 Cuba 00 06 2021 00 06 2021 60 2 1 2008 47 2 2 2 2002 38 10 10 489-91 3 2015 30 131-8 4 2012 30 12 12 6-66 5 2018 29 3 3 269-380 6 1997 63 1497-502 7 1952 2 1-7 8 2019 58 1 1 11