1. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
2. Department of Otolaryngology Research, The Johns Hopkins University School of Medicine, Baltimore, Maryland
3. Viroclinics-DDL Diagnostic Laboratory, Rijswijk, the Netherlands
4. Division of Infections and Cancer Epidemiology, German Cancer Research Center (DKFZ), Heidelberg, Germany
5. Department of Otolaryngology–Head and Neck Surgery, Johns Hopkins Hospital, Baltimore, Maryland