Received: 19 April 2020
Accepted: 7 September 2020
First Online: 10 October 2020
Ethics approval and consent to participate
: Protocols were approved by the institutional review board at Fiocruz-PE and Universidade de Pernambuco (UPE) and was conducted in accordance with the Declaration of Helsinki, the International Conference on Harmonisation guideline for Good Clinical Practice, and the codes and regulations of Brazil regarding research on human subjects. Written informed consent was obtained from parents or guardians. The study protocols are available at the MERG website.
: Does not apply.
: The authors declare that they have no competing interests.