1. Department of Paediatric Gastroenterology, Hepatology and Nutrition, Third Department of Paediatrics Attikon University General Hospital, National and Kapodistrian University of Athens Athens Greece
2. Department of Pediatric Surgery Attikon University General Hospital, National and Kapodistrian University of Athens Athens Greece
3. First Department of Pathology Medical School, National and Kapodistrian University of Athens Athens Greece
4. First Department of Pathology Medical School, Laiko General Hospital, National and Kapodistrian University of Athens Athens Greece