2236-3459 2236-3459 S2236-34592013000100129 10.1590/S2236-34592013000100008 Brazil Brazil Brazil 00 04 2013 00 04 2013 17 39 129 151

23 4 4 315-48 13 24 24 47-80 12 1 1 11-28 28 100 100 715-35 11 22 22 9-30 5 3 3 343-85