0102-4698 0102-4698 S0102-46982014000400181 10.1590/S0102-46982014000400009 Brazil Brazil 00 12 2014 00 12 2014 30 4 181 203

91 227 227 122-43 31 113 113 1355-379 12 34 34 94-181 1 1 1 13-40