Funding for this research was provided by:
Fundação para a Ciência e a Tecnologia (GHTM - UID/Multi/04413/2013)
Received: 24 June 2019
Accepted: 27 March 2020
First Online: 15 April 2020
Ethics approval and consent to participate
: Ethical clearance was secured from the Ethics Council of the Institute of Hygiene and Tropical Medicine, NOVA University of Lisbon (Parecer N°14.18). A consent form was prepared, stating the goals of our research protocol, and it was signed by all participants.
: Not applicable.
: The authors declare that they have no competing interests.