1. Physiology Department, Federal University of Rio Grande do Sul, 90050-170 Porto Alegre, RS, Brazil
2. Northern Ontario School of Medicine, Lakehead University, Thunder Bay, Canada P7B 5E1
3. Faculty of Pharmacy, University of Buenos Aires, Buenos Aires 1121, Argentina
4. Santa Casa de Misericórdia School of Medicine (EMESCAM), 29027-502 Vitória, ES, Brazil
5. Pharmacology Department, University of Athens, 11527 Athens, Greece