1. Department of Epidemiology, Asfendiyarov Kazakh National Medical University, Almaty, Kazakhstan
2. Division of HIV-Infection and Infection Control, Asfendiyarov Kazakh National Medical University, Almaty, Kazakhstan
3. Department of Epidemiology and Biostatistics, University at Albany, SUNY, Albany, NY, USA
4. Department of Medicine, SUNY Downstate Medical Center, Brooklyn, NY, USA