Prevalence of beta and gamma human papillomaviruses in the anal canal of men who have sex with men is influenced by HIV status - Torres, Montserrat; Gheit, Tarik; McKay-Chopin, Sandrine; Rodríguez, Carmen; Romero, Jorge Del; Filotico, Raffaele; Doná, Maria Gabriella; Ortiz, Marta; Tommasino, Massimo (Journal of Clinical Virology, 2015)