1517-9702 1517-9702 S1517-97022015000200309 10.1590/S1517-97022015041822 Brasil Brasil 00 04 2015 00 04 2015 41 2 309 324

37 1 1 35-46 27 1 1 3-22 1 2 65-82 4 18 52 52 155-69 13 85 85 33-47 9 327-52 7 8-28