1981-4690 1981-4690 S1981-46902014000400671 10.1590/1807-55092014000400671 Brazil 00 12 2014 00 12 2014 28 4 671 682

15 57-66 1 71-80 8 77-84 26 531-40 6 115-19 24 9-26 25 3 3 497-511 12 21-8 24 103-19 16 682-88 2 6-12 25 113-28 61 89-100