1. Program of Postgraduation in Pharmaceutical Sciences, College of Pharmacy; Federal University of Rio Grande do Sul; 2752 Ipiranga Avenue, Santana 90610-000 Porto Alegre Rio Grande do Sul Brazil
2. Research Center on Alcohol and Drugs; Federal University of Rio Grande do Sul; 400, Álvaro Alvim Street 90420-020 Porto Alegre Rio Grande do Sul Brazil