1. Department of Biomedical and Biotechnological Sciences, University of Catania, I‑95123 Catania, Italy
2. Epidemiology Unit, IRCCS Istituto Nazionale Tumori ‘Fondazione G. Pascale’, I‑80131 Naples, Italy
3. Laboratory of Clinical Virology, Medical School, University of Crete, 70013 Heraklion, Greece