1659-0775 1659-0775 S1659-07752020000100071 Costa Rica Costa Rica 00 06 2020 00 06 2020 32 71 78

1 2 3 2015 11 4 2014 4 5. 6. 2009 1 7 8 2005 1 01-6 9 2010 5 10. 2005 1 11 2003 13 233-2244 12 1996 6 13. 14