Funding for this research was provided by:
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (23038.007740/2012-97)
Received: 1 February 2020
Accepted: 4 June 2020
First Online: 26 June 2020
Ethics approval and consent to participate
: This study was approved by the Research Ethics Committee of the Federal University of Rio Grande do Norte (#340.110) and written informed parental consent was obtained on behalf of all participants.
: All authors consent to the publication of the manuscript in BMC Research Notes.
: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential competing interests.