1. Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil;
2. Division of Renal Transplant, Kidney and Hypertension Hospital, Federal University of São Paulo, São Paulo, Brazil;
3. Division of Virology, Institute of Tropical Medicine of São Paulo, University of São Paulo, São Paulo, Brazil;
4. Division of Renal Transplant, Social Institute of Health Care, Campina Grande, Brazil