Acknowledgments
This study was supported by the National Council for Scientific and Technological Development (CNPq), the Coordination for the Improvement of Higher Level Education Personnel (CAPES) and the State of Minas Gerais Research Foundation (FAPEMIG), Brazil, and the PrĂ³-reitoria Pesquisa of the Universidade Federal Minas Gerais, Brazil. ALPR is a fellow of CNPq.