1 Department of Internal Medicine, Faculty of Medicine, Federal University of Uberlândia, Uberlândia, Minas Gerais, Brazil.
2 Protein Chemistry Center, Regional Center for Hemotheraphy of Ribeirão Preto and the Department of Cellular and Molecular Biology and Pathogenic Bioagents, Faculty of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.