1. Bács-Kiskun County Teaching Hospital, Kecskemét, Hungary
2. Department of Public Health and Microbiology, University of Turin, Turin, Italy
3. Department of Biological Science and Human Oncology, University of Turin, Turin, Italy
4. Centre for Oncologic Prevention of Piedmont, Turin, Italy
5. Surgical Oncology, Department of Medical and Surgical Disciplines, University of Turin, Turin, Italy