1405-6666 1405-6666 S1405-66662006000300721 Mexico 00 09 2006 00 09 2006 11 30 721 739 1996 2443 4ª 1989 15-23 2000 5 1-26 1995 35-9 2002 139-55 2003 7 357-68 2006 1996 399-404 2006