1. First Department of Surgery, National and Kapodistrian University of Athens, Laikon General Hospital, Athens, Greece
2. Department of Abdominal Surgery, Clarunis, University Center for Gastrointestinal and Liver Diseases, Basel, Switzerland
3. Surgical Department, General Hospital of Ierapetra, Ierapetra, Greece
4. First Department of Propaedeutic Surgery, National and Kapodistrian University of Athens, Hippocration Hospital, Athens, Greece