Funding for this research was provided by:
Fundação para a Ciência e a Tecnologia (SFRH/BPD/99616/2014)
Text and Data Mining valid from 2019-07-05
Received: 1 June 2018
Accepted: 4 May 2019
First Online: 5 July 2019
Compliance with ethical standards
: The authors have no conflict of interests to declare while conducting this research.