0026-1742 0026-1742 S0026-17422018000400026 Mexico Mexico 00 08 2018 00 08 2018 61 4 26 29

1 2003 17 75-85 2 1999 9 9-11 3 1989 4 2006 51 2 2 70-2 5 2006 118 6 6 1349-57 6 2001 7 1995 8 2007 17 1 1 5-15 9 2008 34 2 2 34-9