1. Infections and Immunoepidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute , Rockville, MD, USA
2. Trans-Divisional Research Program, Division of Cancer Epidemiology and Genetics, National Cancer Institute , Rockville, MD, USA
3. Bureau of Cancer Epidemiology, New York State Department of Health , Albany, NY, USA
4. HIV/STD/HCV Epidemiology and Surveillance Unit, Texas Department of State Health Services , Austin, TX, USA