title: Editorial note.
authors.affiliation: Universidade Tecnológica Federal do Paraná, Curitiba, PR, Brazil.
authors.forename: F H
authors.initials: FH
authors.lastname: Passig
authors.affiliation: Universidade Tecnológica Federal do Paraná, Campo Mourão, PR, Brazil.
authors.forename: E J
authors.initials: EJ
authors.lastname: Arantes
authors.affiliation: Universidade Estadual de Maringá, PR, Brazil.
authors.forename: C R G
authors.initials: CR
authors.lastname: Tavares
authors.affiliation: Universidade Federal do Maranhão, MA, Brazil.
authors.forename: M V J
authors.initials: MV
authors.lastname: Cutrim
authors.affiliation: Universidade Feevale, Novo Hamburgo, RS, Brazil.
authors.forename: M A S
authors.initials: MA
authors.lastname: Rodrigues