1. Department of Physiology and Pharmacology, Institute of Biology, Federal University of Pelotas, Pelotas, Rio Grande del Sul, Brazil.
2. Post-Graduate Program in Dentistry, Federal University of Pelotas, Pelotas, Rio Grande del Sul, Brazil.
3. Pelotas Dental School, Federal University of Pelotas, Pelotas, Rio Grande del Sul, Brazil.