Funding for this research was provided by:
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Scholarship)
Text and Data Mining valid from 2019-04-10
Received: 13 September 2018
Accepted: 3 April 2019
First Online: 10 April 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.