Funding for this research was provided by:
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Conselho Nacional de Desenvolvimento Científico e Tecnológico (481667/2012-1, 306230/2013-5)
Text and Data Mining valid from 2019-02-12
Accepted: 5 February 2019
First Online: 12 February 2019
Compliance with ethical standards
: All the authors have no conflict of interests.