Funding for this research was provided by:
Fundação para a Ciência e a Tecnologia (UID/AGR/00690/2013, PEst/UID/QUI/50006/2013, UID/QUI/00062/2013, SFRH/BD/95853/2013)
Text and Data Mining valid from 2018-11-16
Received: 27 June 2018
Accepted: 28 October 2018
First Online: 16 November 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human or animal subjects.