0102-7735 0102-7735 S0102-77352014000300099 10.5238/2015v50i360005 Brazil 00 09 2014 00 09 2014 50 36 99 124

91 91 23-52 26 92 92 725-51 19 39 39 49-64 31 112 112 729-48 19 19 129-38 33 119 119 379-404