1. Center of Biophotonics, School of Dentistry, Federal University of Bahia, Salvador, Bahia, Brazil.
2. National Institute of Optics and Photonics, University of São Paulo, Physics Institute of São Carlos, São Carlos, São Paulo, Brazil.
3. Institute of Biomedical Engineering, Unicastelo, São José dos Campos, São Paulo, Brazil.
4. Laboratory of Surgical Pathology, School of Dentistry, Federal University of Bahia, Salvador, Bahia, Brazil.