Funding for this research was provided by:
Fundação para a Ciência e a Tecnologia (SFRH/BD/51994/2012)
Qatar National Research Fund (NPRP8-2297-3-494)
Received: 4 September 2019
Accepted: 23 December 2019
First Online: 3 January 2020
Ethics approval and consent to participate
: This research project was approved by the Institutional Review Board, Medical School of the University of Coimbra, Coimbra, Portugal. Written informed consent was obtained from each participant before enrollment into the study.
: Not applicable.
: The authors declare that they have no competing interests.