1982-7806 1982-7806 S1982-78062017000300770 10.14393/che-v16n3-2017-13 Brasil Brazil Brazil 00 12 2017 00 12 2017 16 3 770 787

17 2 2 227-54 28 2 2 43-64 14 31 31 121-53 11 21 21 89-103 7 7 41 407-30 51 51 9-28