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GP coauthors/coeditors: Carlos A S de Assis, Adriano C Machado Pereira, Marconi de Arruda Pereira, Clodoveu Augusto Davis Junior, Joao Antonio de Vasconcelos, Alexandre Pimenta, Frederico Gadelha Guimaraes, Ciniro Aparecido Leite Nametala, Ricardo Hiroshi Caldeira Takahashi,