0187-0173 0187-0173 S0187-01732007000300253 Mexico 00 12 2007 00 12 2007 22 65 253 263 2006 2006 1992 1968 2000 19-36 2000 37-42 1997 7 7 2003 2001 2 3 3 2000 49-52 1995 2000 53-5 1994