1. Department of Hepato‑biliary and Pancreatic Surgery, Metropolitan Hospital, 18547 Piraeus, Greece
2. Third Department of Surgery, ‘Attiko’ University Hospital, School of Medicine, National and Kapodistrian University of Athens, 12462 Athens, Greece
3. Second Propaedeutic Surgical Department, ‘Laiko’ Hospital, School of Medicine, National and Kapodistrian University of Athens, 11527 Athens, Greece
4. Department of Anaesthetics, General District Hospital of Nikaia ‘Agios Panteleimon’, 18454 Nikaia, Greece