1409-3871 1409-3871 S1409-38712018000300189 10.15517/lank.v18i3.34981 USA USA Cuba 00 12 2018 00 12 2018 18 3 189 192

2014 2009 2007 7 1-2 1-2 141-6 2018 1990 1973 7 1-205 1986