The Frequency of Human Papillomavirus Positivity in Iranian Patients with Head and Neck Squamous Cell Carcinoma oleh Mitra Rezaei, Mahboobeh Karimi-Galougahi, Azin Kheradmand, Mihan Pourabdollah Toutkaboni, Hassan Mir Mohammad Sadeghi, Alireza Abdollahi, Amirnader Emami Razavi, Ali Safavi Naini, Farahnaz Bidari- Zerehpoosh