1. Department of Epidemiology and Biostatistics Temple University College of Public Health Philadelphia PA USA
2. Department of Mathematics and Statistics Williams College Williamstown MA USA
3. Department of Epidemiology University of Kentucky College of Public Health Lexington KY USA
4. Center on Drug and Alcohol Research, Department of Behavioral Science University of Kentucky College of Medicine Lexington KY USA
5. Center for Health Equity Transformation University of Kentucky Lexington KY USA