2317-0972 2317-0972 S2317-09722015000100031 10.2014/LTP-v33n64jan0003 Brazil 00 06 2015 00 06 2015 33 64 31 47

26 329-76 68 68 9-56 7 1 1 1-23 25 2 2 59-75 28 12 12 66-71