1517-9702 1517-9702 S1517-97022014000400999 10.1590/s1517-97022014041219 Brazil Brazil 00 12 2014 00 12 2014 40 4 999 1014

14 3 3 239-59 8 1 1 20 50 50 9-25 11 33 33 450-562 6 11 11 3 33-45 34 34 13 3 3 185-205 6 3 3 463-93 17 31 31 11-9 21 1 1 21-5