2236-3459 2236-3459 S2236-34592013000300079 10.1590/S2236-34592013000300006 Brazil 00 09 2013 00 09 2013 17 41 79 101

15 9 9 465-72 11 1 1 67-92 410 447-54 231-60 78 188/189/190 188/189/190 374-95 3 4 4 97-105 11 21 21 199889 28 2 2 89-114 360-64