2306-4102 2306-4102 S2306-41022018000400209 Mexico Mexico 00 08 2018 00 08 2018 32 4 209 213

1 2002 10 20 20 75-81 2 2010 5 1 1 77-81 3 1993 18 1 1 91-9 4 1992 21 4 4 451-3 5 1996 21 A A 357-9 6 1997 22 4 4 621-7 7 1993 18 5 5 620-3 8 1990 15 6 6 934-9 9 2006 31 1 1 22-7 10 1997 22 4 4 635-9 11 1993 18 1 1 113-20 12 1997 25 2 2 112-7 13 2009 111 1 1 28-33 14 1997 41 1 1 76-82 15 1997 25 2 2 141-5 16 1995 3 2 2 249-64 17 1994 19 3 3 416-9 18 1992 45 4 4 373-6 19 1993 75 11 11 1585-92