Low HPV16 E6 Seroprevalence in HNSCC: A Prospective Study in Brazil. - Xavier, Enes Buck Mutiua Cantala; Daniel, Camila Batista; de Abreu, Priscila Marinho; do Valle, Isabella Bittencourt; Athaydes, Brena Ramos; Figueira, Frederico Firme; Sena, Agenor; de Souza, Evandro Duccini; Waterboer, Tim; von Zeidler, Sandra Ventorin (Journal of Clinical Medicine, 2026)