1. Second Department of Propaedeutic Surgery, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Hippokration General Hospital of Thessaloniki, Aristotle University of Thessaloniki, Thessaloniki, Greece

2. Department of Hygiene, Social-Preventive Medicine and Medical Statistics, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessalonik, Thessalonik, Greece

3. Cyanous Stavros, Euromedica, Thessaloniki, Greece

4. Department of Radiation Oncology, St. Luke's Hospital, Thessaloniki, Greece