1. Department of Health Sciences, College of Health Professions and Sciences, University of Central Florida, Orlando, FL, USA
2. Center for Drug Use and HIV/HCV Research, New York University, New York, NY, USA
3. Department of Social and Behavioral Sciences, School of Global Public Health, New York University, New York, NY, USA
4. Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
5. Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA