Funding for this research was provided by:
Fundação para a Ciência e a Tecnologia (PTDC/DPT-EPI/0412/2012, SFRH/BD/119420/2016)
Text and Data Mining valid from 2018-09-04
Received: 8 January 2018
Accepted: 17 August 2018
First Online: 4 September 2018
Ethics approval and consent to participate
: The study protocol was reviewed by the ethics committee for Life Sciences and Health of the University of Minho (REF: SECVS-084/2013) and was conducted in accordance with the principles of the Declaration of Helsinki. Written informed consent was obtained from individuals that agreed to participate in face-to-face interviews. The study was registered with the Portuguese data protection authority with the reference 9936/2013 and received approval number 5982/2014.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.