1. Department of Pediatrics, General Hospital of Ioannina "G. Xatzikosta", Ioannina, Greece
2. Department of Surgery, University Hospital of Ioannina, Ioannina, Greece
3. Department of Surgery, General Hospital "G. Xatzikosta", Ioannina, Greece
4. Department of Surgery, General Hospital of Filiates, Thesprotia, Greece
5. Intensive Care Unit, University Hospital of Ioannina, Ioannina, Greece
6. Anatomy-Histology-Embryology, University of Ioannina, Ioannina, Greece
7. Department of Pathology, Agia Sofia Children's Hospital, Athens, Greece
8. Department of Orthopaedics, University Hospital of Ioannina, Ioannina, Greece