0102-7735 0102-7735 S0102-77352014000100086 10.5238/2015v48i340005 Brazil 00 04 2014 00 04 2014 48 34 86 115

12 15 15 13-33 11 6 6 595-610 25 2 2 57 1 1 1-22 33 5 5 493-514 35 3 3 479-503