作者单位:Department of Internal Medicine, Medical School of Ribeir?o Preto, University of S?o Paulo, S?o[1]University of Uberaba, Minas Gerais, Brazil[2]Department of Chemistry and Polymers Technology, University of S?o Paulo, S?o Carlos, Brazil[3]Biochemistry and Biophysical Laboratory, Institute Butantan, S?o Paulo, Brazil, Faculty of Medicine[4]