0104-026x 0104-026x S0104-026x2015000300004 10.1590/0104-026X2015v23n3p713 Brazil Brazil 00 09 2015 00 09 2015 23 3 713 734

9 1 1 231-52 37 37 9 1 1 167-206 11 54-9 15 44 44 91-102 52 1 1 201-21 31 31 425-60