Funding for this research was provided by:
Conselho Nacional de Pesquisa e Desenvolvimento - CNPq (455965/2014-5)
Text and Data Mining valid from 2019-07-13
Received: 1 May 2019
Accepted: 5 July 2019
First Online: 13 July 2019
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.