Funding for this research was provided by:
Conselho Nacional de Desenvolvimento Cientifico e Tecnológico - CNPq (303431/2016-4)
Text and Data Mining valid from 2019-06-01
Received: 21 October 2018
Accepted: 27 May 2019
First Online: 3 June 2019
Compliance with ethical standards
: The authors declare that there is no conflict of interest.