Funding for this research was provided by:
Fundação para a Ciência e a Tecnologia (SFRH/BD/70727/2010, POCI-01-0145-FEDER-006961)
Text and Data Mining valid from 2018-01-29
Received: 2 May 2016
Accepted: 12 January 2018
First Online: 29 January 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.