2236-3459 2236-3459 S2236-34592013000200291 10.1590/S2236-34592013000200014 Brazil 00 08 2013 00 08 2013 17 40 291 317

6 11 11 117-30 30 1 1 139-59 21 75 75 109-29 12 24 24 121-53