1. Infectious Disease Program, Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
2. International Agency for Research on Cancer, Gambia Hepatitis Intervention Study, Banjul, The Gambia
3. Department of Medicine, Lagos University Teaching Hospital, Lagos, Nigeria
4. Medical Research Council Laboratories, Banjul, The Gambia
5. Department of Medical Services, Royal Victoria Teaching Hospital, Government of The Gambia, Banjul, The Gambia
6. Department of Radiodiagnosis, National Hospital, Abuja, Nigeria
7. London School of Hygiene and Tropical Medicine, London, United Kingdom
8. Infections and Immunoepidemiology Branch, Division of Cancer Epidemiology and Genetics, Department of Health and Human Services, National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland, USA
9. International Agency for Research on Cancer, Gambia Hepatitis Intervention Study, Lyon, France