1. Division of Cancer Epidemiology and Genetics, National Cancer Institute; National Institutes of Health; Bethesda Maryland
2. Head and Neck Surgery, Department of Otolaryngology; Johns Hopkins University; Baltimore Maryland
3. International Agency for Research on Cancer; Lyon France
4. Division of Molecular Diagnostics of Oncogenic Infections, Infection, Inflammation and Cancer Program; German Cancer Research Center; Heidelberg Germany
5. Infections and Cancer Epidemiology, Infection, Inflammation and Cancer Program; German Cancer Research Center; Heidelberg Germany