Funding for this research was provided by:
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Text and Data Mining valid from 2018-01-11
Received: 19 September 2017
Accepted: 5 December 2017
First Online: 11 January 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The study was approved by the local Research Ethics Committee and the subjects gave written informed consent.