1. Department of Surgery, University Hospital of Ioannina, Ioannina, Greece
2. Department of Surgery, General Hospital of Ioannina G. Xatzikosta, Ioannina, Greece
3. Department of Surgery, General Hospital of Filiates, Filiates, Greece
4. Department of Pathology, Agia Sofia Children’s Hospital, Athens, Greece
5. Department of Radiology, University Hospital of Ioannina, Ioannina, Greece
6. Department of Anesthesiology, University Hospital of Ioannina, Ioannina, Greece