Barriers related to non-adherence in a mammography breast-screening program during the implementation period in the interior of São Paulo State, Brazil oleh René Aloisio da Costa Vieira, Tânia Silveira Lourenço, Edmundo Carvalho Mauad, Valter Gonçalves Moreira Filho, Stela Verzinhasse Peres, Thiago Buosi Silva, Maria do Rosário Dias de Oliveira Lattore