1. General Surgeon, Private practice, Athens , Greece
2. Associate Professor of Pediatric Surgery, Department of Pediatric Surgery, Attikon University Hospital, University of Athens School of Medicine, Athens , Greece
3. Consultant Surgeon, 3rd Department of Surgery, Attikon University Hospital, University of Athens School of Medicine, Athens , Greece
4. Associate Professor Surgery, 3rd Department of Surgery, Attikon University Hospital, University of Athens School of Medicine, Athens , Greece
5. Resident Surgeon, 3rd Department of Surgery, Attikon University Hospital, University of Athens School of Medicine , Athens , Greece