1405-9436 1405-9436 S1405-94362016000100082 Costa Rica 00 06 2016 00 06 2016 5 43 82 123

2008 2008 1992 1996 1990 2007 8 2 2 2005 1995 2001 1996 2005 2001 2001 2005 2000 2000 1994 1997 2007 2004 30 1 1 2002 2008 2008 2004 1990 1998