Funding for this research was provided by:
Conselho Nacional de Desenvolvimento Científico e Tecnológico (446927/2014-7, 474847/2013-6)
Text and Data Mining valid from 2018-12-11
Received: 4 September 2018
Accepted: 5 December 2018
First Online: 11 December 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.