Funding for this research was provided by:
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Text and Data Mining valid from 2018-10-11
Received: 28 February 2018
Accepted: 1 October 2018
First Online: 11 October 2018
Compliance with Ethical Standards
: All the authors declare that they have no conflict of interest.