1. European Interbalkan Medical Center, Pylaia, Greece
2. Medical School, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
3. Shakolas Educational Centre for Clinical Medicine, University of Cyprus, Nicosia, Cyprus
4. 1st Department of Internal Medicine, G. Papanikolaou General Hospital of Thessaloniki, Thessaloniki, Greece
5. Cardiff Transplant Unit, University Hospital of Wales, Cardiff and Vale University Health Board, Cardiff, Wales, United Kingdom
6. 3rd Surgical Department, University General Hospital of Thessaloniki “AHEPA”, School of Medicine, Faulty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
7. Medical School, Faculty of Health Sciences, University of Ioannina, Ioannina, Greece
8. Department of Pathology, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece