1. Post-doctoral researcher, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece
2. 1st Department of Surgery, School of Medicine, Aristotle University of Thessaloniki, General Hospital Papageorgiou, Thessaloniki, Greece
3. 1st Propaedeutic Surgery Department, School of Medicine, Aristotle University of Thessaloniki, General Hospital AHEPA, Thessaloniki, Greece
4. Statistician, University of Peloponese, Tripoli, Grecee