Funding for this research was provided by:
Conselho Nacional de Desenvolvimento Científico e Tecnológico (460185/2014-4)
Fundação Amazônia Paraense de Amparo à Pesquisa (PPSUS/2013)
Received: 16 January 2020
Accepted: 8 June 2020
First Online: 26 June 2020
Ethics approval and consent to participate
: Octávio Lobo Children’s Cancer Hospital ethics committee approved this study (CAAE: 00905812.1.0000.00.18). Written consent forms were obtained from all parents of patients and enabled the collection of biological samples and publication of results.
: Consent forms from the parents of patients were obtained to publish and to report individual data<b>.</b>
: The authors declared that they have no conflict of interest.