1. Division of General Pathology, Department of Stomatology, School of Dentistry, University of Sao Paulo, Sao Paulo, Brazil;
2. Laboratory of Virology, Institute of Tropical Medicine of Sao Paulo, University of Sao Paulo, Sao Paulo, Brazil;
3. Department of Oral Medicine and Pathology, Institute of Odontology, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden;
4. Department of Endodontology, Institute of Odontology The Sahlgrenska Academy University of Gothenburg, Gothenburg, Sweden