1. Department of General Surgery and Medical Surgery Specialties, Gynecological Clinic, University of Catania, 95123 Catania, Italy
2. Multidisciplinary Research Center in Papillomavirus Pathology, University of Catania, 95123 Catania, Italy
3. Department of Biomedical and Biotechnological Sciences, Clinical Virology, University of Catania, 95123 Catania, Italy