1. Laboratory of Virology, Institute of Tropical Medicine of São Paulo, School of Medicine, University of São Paulo, São Paulo, Brazil
2. Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
3. Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil
4. Division of Renal Transplantation, Kidney and Hypertension Hospital, Federal University of São Paulo, São Paulo, Brazil