1982-7806 1982-7806 S1982-78062017000200434 10.14393/che-v16n2-2017-7 Brazil 00 08 2017 00 08 2017 16 2 434 450

3 23 23 1 8 8 7 87-88 87-88 7 90-91 90-91 2 12 12 17 925 925 1 1 1 2 12 12 4 29 29 7 90-91 90-91