Text and Data Mining valid from 2019-08-16
Received: 6 March 2019
Accepted: 7 August 2019
First Online: 16 August 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interests.
: The study protocol was approved by the Ethics Committee of Catholic University of Pelotas, Pelotas, Brazil (Protocol number 2010/15). All participants signed the written informed consent.