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Antibody seroprevalence among HPV-positive oropharyngeal (HPV-OPC) cases, HPV-positive nonoropharyngeal (HPV-nonOPC) cases, and matched noncancer controls. Bars represent 95% confidence interval. High risk denotes any one of HPV types 16, 18, 31, 33, 35, 45, 52, 58. “E proteins” are defined as seropositive for any three of E1, E2, E6, E7 for HPV type 16.
