1. First Department of Propaedeutic Surgery, Athens Medical School, National and Kapodistrian University of Athens, Hippocration General Athens Hospital, Athens 11527, Greece
2. Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Whitechapel, E1 2AT London, UK
3. First Department of Surgery, Athens Medical School, National and Kapodistrian University of Athens, Laikon General Hospital, Goudi, Athens 11527, Greece