1 UCL, Faculty of Medical Sciences, Division of Surgery and Interventional Science, London, UK; University of Thessaly, Department of Surgery, Biopolis, Larissa, Greece.
2 University of Thessaly, Department of Surgery, Biopolis, Larissa, Greece.
3 University of Thessaly, Department of Surgery, Biopolis, Larissa, Greece. Electronic address: [email protected].