Funding for this research was provided by:
Fundação para a Ciência e a Tecnologia (SFRH/BPD/100865/2014, SFRH/BPD/74868/2010, SFRH/BD/116801/2016)
Text and Data Mining valid from 2019-02-15
Received: 19 October 2018
Accepted: 8 February 2019
First Online: 15 February 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.