1982-7806 1982-7806 S1982-78062017000300653 10.14393/che-v16n3-2017-6 Brazil 00 12 2017 00 12 2017 16 3 653 665

27 47 47 917-38 2 230-53 1 1 15 837-55 2 185-99 40 40 47-61 27 47 47 981-1005 6 144-65 2 168-84 2 2 2 28-49 27 939-55 27 955-80