2236-3459 2236-3459 S2236-34592013000200221 10.1590/S2236-34592013000200011 Brazil Brazil 00 08 2013 00 08 2013 17 40 221 250

11 11 117-30 1 1 1 46-55 4 4 5-27 1 10 10 18-30 5 14 14 35-50 45 45