1. Center for Drug and Alcohol Research, Hospital de Clínicas de Porto Alegre (HCPA), Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil;
2. Center for Health Services Research, University of Kentucky, Lexington, Kentucky, USA;
3. Center for Applied Research on Substance Use and Health Disparities (ARSH), Nova Southeastern University, Miami, Florida, USA