Funding for this research was provided by:
Fundação para a Ciência e a Tecnologia (UID/CTM/50025/2013)
Text and Data Mining valid from 2019-08-09
Received: 17 April 2019
Accepted: 2 August 2019
First Online: 9 August 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This research did not involve human participants or animals.