Funding for this research was provided by:
Fundação de Amparo à Pesquisa do Estado de São Paulo (2008/56147-1)
Text and Data Mining valid from 2018-09-07
Received: 9 August 2018
Accepted: 28 August 2018
First Online: 7 September 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.