Funding for this research was provided by:
Horizon 2020 Framework Programme (No 733280)
Care and Public Health Research Institute, Universiteit Maastricht
European Regional Development Fund (POCI-01-0145-FEDER-006862)
Fundação para a Ciência e a Tecnologia (Ref.UID/DTP/04750/2019)
Received: 13 February 2020
Accepted: 7 January 2021
First Online: 25 January 2021
Ethics approval and consent to participate
: Ethical approval for this study was given by the Ethics Committee of the Institute of Public Health of the University of Porto (ISPUP) [March 22, 2018] and by the National Commission for Data Protection (CNPD) [April, 20, 2018] [Proc. no. 7360/ 2018]. Consent to participate was obtained by all participants through explicit written consents according to the data protection policy of the General Data Protection Regulation (GDPR) [(EU) Regulation 2016/67].
: Not applicable.
: The authors declare that they have no competing interests.