1405-888X 1405-888X S1405-888X2007000200074 Mexico 00 00 2007 00 00 2007 10 2 74 77 1 1981 71 891-2 2 1990 83-103 3 4 1998 7-1 y 7-2 5 2000 306-17 6 2006 7 2007 155 6 6 342-9 8 1995 85 1 1 29-36 9 2006 39 4 4 289-301