4. Acknowledgements
This study was supported in part by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação de Amparo a Pesquisa de Minas Gerais (FAPEMIG) and the Universidade Estadual de Montes Claros (UNIMONTES). The author MSSA thank to CNPq for their research fellowship. To the Program for Technological Development in Tools for Health-RPT-FIOCRUZ for using the flow cytometry facilities.