2238-2097 2238-2097 S2238-20972018000400839 10.29286/rep.v27i66.4286 Brazil 00 09 2018 00 09 2018 27 66 839 857

2003 37-57 2007 2011 2000 DATAFOLHA. Instituto de Pesquisa 2002 95-117 2010 2001 17-44 1978 2003 2010 2002