1. Addiction Sciences Division, Department of Psychiatry & Behavioral Neuroscience, University of Cincinnati College of Medicine, Cincinnati, OH USA
2. Department of Behavioral Sciences and Health Education, Rollins School of Public Health, Emory University, Atlanta, GA, USA
3. Centers for AIDS Research, Emory University, Atlanta, GA, USA
4. Department of Pediatrics (Division of Infectious Diseases, Epidemiology and Immunology), Emory University School of Medicine, Atlanta, GA, USA
5. Saint Petersburg AIDS Center, Saint Petersburg, Russia
6. Stellit, Saint Petersburg, Russia
7. North-West District AIDS Center, Saint Petersburg, Russia
8. Department of Socially Significant Infections, First Pavlov State Medical University, Saint Petersburg, Russia