Funding for this research was provided by:
National Council for Scientific and Technological Development (CNPq) of Brazil (150866/2017-8)
Text and Data Mining valid from 2019-07-09
Received: 25 January 2019
Accepted: 18 June 2019
First Online: 9 July 2019
Compliance with Ethical Standards
: The authors declare that there is no conflict of interests regarding the publication of this paper.