2444-6483 2444-6483 S2444-64832020000300108 10.24875/end.20000045 Venezuela 00 09 2020 00 09 2020 32 3 108 110

1 2006 30 1500-6 2 2006 74 195-8 3 2014 6 2 2 65-72 4 1998 13 10 10 1072-3 5 2003 18 83-7 6 2013 19 6122-4 7 2007 13 25-32 8 1998 85 7 7 907-10