2238-2097 2238-2097 S2238-20972016000200355 10.2016/repub-v25n59maio.ago009 Brazil 00 05 2016 00 05 2016 25 59 355 365

12 3 3 57-82 4 2 2 4-16 11 2 2 327-45 25 366-71 14 14 84-90 88 88 78-88