2238-2097 2238-2097 S2238-20972015000100013 10.2015/repub-v25n55jan.abr002 Brazil Brazil 00 04 2015 00 04 2015 24 55 13 32

23 81 81 21-47 11 21 21 42-72 21 73 73 85-97 2 2 42-60 11 21 21 73-93