Funding for this research was provided by:
Conselho Nacional de Desenvolvimento Científico e Tecnológico (444367/2014-4)
Text and Data Mining valid from 2019-12-09
Received: 21 May 2019
Accepted: 11 November 2019
First Online: 9 December 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.