Funding for this research was provided by:
Fundação para a Ciência e a Tecnologia (UID/GES/00315/2019)
Text and Data Mining valid from 2019-08-23
Received: 1 February 2019
Accepted: 13 August 2019
First Online: 23 August 2019
Ethics approval and consent to participate
: Not applicable
: Not applicable.
: The author declares no competing interests.