0102-4698 0102-4698 S0102-46982015000200229 10.1590/0102-4698134352 Brazil 00 04 2015 00 04 2015 31 2 229 251

23-31 2 177-229 1 115-39 171-98 63-78 79-110 31-62 1 Editions du CRP 111-40 257-75 169-90 Rio de Janeiro 137-68 28 2 2 21 73 73