2177-6059 2177-6059 S2177-60592016000100219 10.18593/r.v41i1.9269 Brazil Brazil Brazil Brazil 00 01 2016 00 01 2016 41 1 219 240

20 20 9-42 30 1 1 73-89 11 1 1 156-69 12 12 131-51