STOP HPV study protocol: a nationwide case–control study of the association between oropharyngeal cancer and human papillomavirus (HPV) infection in Brazil by Juliana Comerlato, Marina Bessel, Natalia Luiza Kops, Jaqueline Driemeyer Correia Horvath, Flávia Moreno Alves de Souza, Gerson Fernando Mendes Pereira, Eliana Marcia Wendland, Daniel Sperb, Cristina Pimenta, Frederico Soares Falcetta

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