Funding for this research was provided by:
Fundação de Amparo à Pesquisa do Estado de São Paulo (grant number 18/10081-1)
Received: 25 November 2019
Accepted: 9 July 2020
First Online: 20 July 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the Human Research Ethics Committee of the Federal University of Sao Carlos (89993118.8.000.5504/2018). Written informed consent to participate was obtained from the parents/guardians of the minors included in this study and assent was signed by the children. Permission was also obtained from the head teachers of the schools.
: Not applicable.
: The authors declare that they have no competing interests.